21987

Number 21987 is an odd five-digits composite number and natural number following 21986 and preceding 21988.

Properties of the number 21987

Nominal	21987
Cardinal	twenty-one thousand nine hundred eighty-seven
Cardinal twenty-one thousand nine hundred eighty-seven
Ordinal	21,987th
Number of digits	5
Sum of digits	27
Product of digits	1008
Number parity	Odd

Previous number is 21986

Next number is 21988

Calculation was done in 0.0000340939 seconds

Prime Factorization of 21987

Prime factorization	3 x 3 x 7 x 349
Prime factorization in exponent form	3² x 7 x 349
Prime factors	3, 7, 349
Number of distinct prime factors ω(n)	3
Total number of prime factors Ω(n)	4
Sum of prime factors	359
Product of prime factors	7329

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Divisors of 21987

List of proper divisors	1, 3, 7, 9, 21, 63, 349, 1047, 2443, 3141, 7329
List of all dividers	1, 3, 7, 9, 21, 63, 349, 1047, 2443, 3141, 7329, 21987
Number of divisors d(n)	12
Sum of all divisors σ(n)	36400
Aliquot sum	14413
21987 is a deficient number , since it is larger than the sum of its proper divisors (14413). Its deficiency is 7574.

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Prime numbers

Is 21987 a prime number?	No
Is 21987 a semiprime number?	No
Is 21987 a Chen prime number?	No
Is 21987 a Mersenne prime number?	No

Previous prime is 21977

Next prime is 21991

Calculation was done in 0.0454051495 seconds

Sequences

Is 21987 a Catalan number?	No
Is 21987 a Fibonacci number?	No
Is 21987 a Idoneal number?	No

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Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.

21987 is not a Happy number

21987 is not a Humble number

21987 is not a Münchhausen number

21987 is not a Perfect number

21987 is not a Perfect square

21987 is not a Palindrome

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Numeric Bases of 21987

In mathematics, a base or radix of a numeral system is the number of unique digits, including zero, used to represent numbers in that system.

Base	System	Value
2	Binary	101010111100011₂
3	Ternary	1010011100₃
4	Quaternary	11113203₄
5	Quinary	1200422₅
6	Senary	245443₆
7	Septenary	121050₇
8	Octal	52743₈
9	Nonary	33140₉
10	Decimal	21987
12	Duodecimal	10883₁₂
16	Hexadecimal	55e3₁₆
20	Vigesimal	2ej7₂₀
36	Base36	gyr₃₆
60	Sexagesimal	66R₆₀

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Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.

Square of 21987 (n²)	483428169
Cube of 21987 (n³)	10629135151803
Square root of 21987	148.28014027509
Natural Logarithm (ln) of 21987	9.998206648594
Decimal Logarithm (log) of 21987	4.3421659764128

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Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.

Sine of 21987	0.84522308861787
Cosecant of 21987	1.1831195970229
Cosine of 21987	-0.53441363237409
Secant of 21987	-1.8712097510641
Tangent of 21987	-1.5815896852463
Cotangent of 21987	-0.63227524137796

Calculation was done in 0.0000078678 seconds

Number parity

Parity is the property of an integer of whether it is even or odd.

Is 21987 an Even Number?

Is 21987 an Odd Number?

Yes, the number 21987 is an odd number.

Total number of all odd numbers from 1 to 21987 is 10994

Sum of all the odd numbers from 1 to 21987 are 120868036

The sum of all odd numbers is a perfect square: 120868036 = 10994

An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.

Previous odd number is 21985

Next odd number is 21989

Calculation was done in 0.0000078678 seconds

Ban number

In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned".

The spelling of 21987 in words is "twenty-one thousand nine hundred eighty-seven", meaning that:

21987 is not an aban number (as it contains the letter a)

21987 is not an eban number (as it contains the letter e)

21987 is not an iban number (as it contains the letter i)

21987 is not an oban number (as it contains the letter o)

21987 is not a tban number (as it contains the letter t)

21987 is not an uban number (as it contains the letter u)

Calculation was done in 0.0000038147 seconds

Numeral systems

How to write 21987 in other number systems?

Bengali numerals	২১৯৮৭
Eastern Arabic numerals	٢١٬٩٨٧
Hieroglyphs numeralsused in Ancient Egypt	𓂭𓂭𓆼𓍪𓎍𓐀
Khmer numerals	២១៩៨៧
Japanese numerals	二万千九百八十七
Roman numerals	n/a
Thai numerals	๒๑๙๘๗

Calculation was done in 0.0001161098 seconds

Translation

How do you say 21987 in 38 different languages?

Arabic	واحد و عشرون ألف و تسعة مائة و سبعة و ثمانون
Croatian	dvadeset i jedna tisuća devetsto osamdeset i sedam
Czech	dvacet jedna tisíc devět set osmdesát sedm
Danish	en og tyve tusinde ni hundrede syv og firs
Dutch	éénentwintigduizend negenhonderdzevenentachtig
Estonian	akpe blaeve vɔ ɖekɛ alafa asieke blaenyi vɔ adre
Faroese	tjúgoeitt tusin og níggjuhundraðogáttatisjey
Filipino	dalawáng pû’t isáng libó’t siyám na daán at walóng pû’t pitó
Finnish	kaksikymmentäyksituhattayhdeksänsataakahdeksankymmentäseitsemän
French	vingt et un mille neuf cent quatre-vingt-sept
Greek	είκοσι μία χίλιάδες εννιακόσια ογδόντα επτά
German	einundzwanzigtausendneunhundertsiebenundachtzig
Hebrew	עשרים ואחד אלף תשע מאות שמונים ושבע
Hindi	इक्कीस हज़ार नौ सौ सत्तासी
Hungarian	huszonegyezerkilencszáznyolcvanhét
Icelandic	tuttugu og eitt þúsund og níuhundrað og áttatíu og sjó
Indonesian	dua puluh satu ribu sembilan ratus delapan puluh tujuh
Italian	ventunomilanovecentoottantasette
Japanese	二万千九百八十七
Korean	이만 천구백팔십칠
Latvian	divdesmit viens tūkstoši deviņsimt astoņdesmit septiņi
Lithuanian	dvidešimt vienas tūkstantis devyni šimtai aštuoniasdešimt septyni
Norwegian	tjueett tusen ni hundre og åttisju
Persian	بیست و یک هزار و نهصد و هشتاد و هفت
Polish	dwadzieścia jeden tysięcy dziewięćset osiemdziesiąt siedem
Portuguese	vinte e um mil novecentos e oitenta e sete
Romanian	douăzeci şi una mii nouă sute optzeci şi şapte
Russian	двадцать одна тысяча девятьсот восемьдесят семь
Serbian	двадесет и једна хиљада деветсто осамдесет и седам
Slovak	dvadsaťjedna tisíc deväťsto osemdesiatsedem
Slovene	dvaset ena tisuću devetsto osemdeset sedem
Spanish	veintiún mil novecientos ochenta y siete
Swahili	elfu ishirini na moja, mia tisa na themanini na saba
Swedish	tjugoentusenniohundraåttiosju
Thai	สองหมื่นหนึ่งพันเก้าร้อยแปดสิบเจ็ด
Turkish	yirmi bir bin dokuz yüz seksen yedi
Ukrainian	двадцять одна тисяча девʼятсот вісімдесят сім
Vietnamese	hai mươi mốt nghìn chín trăm tám mươi bảy

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Miscellaneous

Number 21987 reversed	78912
Unicode Character	U+55E3	嗣
Unix Timestamp	Thu, 01 Jan 1970 06:06:27 +0000

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