21991

Number 21991 is an odd five-digits prime number and natural number following 21990 and preceding 21992.

Properties of the number 21991

Nominal	21991
Cardinal	twenty-one thousand nine hundred ninety-one
Cardinal twenty-one thousand nine hundred ninety-one
Ordinal	21,991st
Number of digits	5
Sum of digits	22
Product of digits	162
Number parity	Odd

Previous number is 21990

Next number is 21992

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Prime Factorization of 21991

Prime factorization	21991
Prime factors	21991
Number of distinct prime factors ω(n)	1
Total number of prime factors Ω(n)	1
Sum of prime factors	21991
Product of prime factors	21991

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Divisors of 21991

List of proper divisors	1
List of all dividers	1, 21991
Number of divisors d(n)	2
Sum of all divisors σ(n)	21992
Aliquot sum	1
21991 is a deficient number , since it is larger than the sum of its proper divisors (1). Its deficiency is 21990.

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Prime numbers

Is 21991 a prime number?	Yes
Is 21991 a semiprime number?	No
Is 21991 a Chen prime number?	Yes
Is 21991 a Mersenne prime number?	No

Previous prime is 21977

Next prime is 21997

Calculation was done in 0.0877168179 seconds

Sequences

Is 21991 a Catalan number?	No
Is 21991 a Fibonacci number?	No
Is 21991 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.

21991 is not a Happy number

21991 is not a Humble number

21991 is not a Münchhausen number

21991 is not a Perfect number

21991 is not a Perfect square

21991 is not a Palindrome

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Numeric Bases of 21991

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	101010111100111₂
3	Ternary	1010011111₃
4	Quaternary	11113213₄
5	Quinary	1200431₅
6	Senary	245451₆
7	Septenary	121054₇
8	Octal	52747₈
9	Nonary	33144₉
10	Decimal	21991
12	Duodecimal	10887₁₂
16	Hexadecimal	55e7₁₆
20	Vigesimal	2ejb₂₀
36	Base36	gyv₃₆
60	Sexagesimal	66V₆₀

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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 21991 (n²)	483604081
Cube of 21991 (n³)	10634937345271
Square root of 21991	148.29362764462
Natural Logarithm (ln) of 21991	9.9983885577308
Decimal Logarithm (log) of 21991	4.3422449785471

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Trigonometry

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

Sine of 21991	-0.14802910957443
Cosecant of 21991	-6.7554280565149
Cosine of 21991	0.98898300426175
Secant of 21991	1.0111397220081
Tangent of 21991	-0.1496781127042
Cotangent of 21991	-6.6810035344063

Calculation was done in 0.0000171661 seconds

Number parity

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

Is 21991 an Even Number?

Is 21991 an Odd Number?

Yes, the number 21991 is an odd number.

Total number of all odd numbers from 1 to 21991 is 10996

Sum of all the odd numbers from 1 to 21991 are 120912016

The sum of all odd numbers is a perfect square: 120912016 = 10996

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 21989

Next odd number is 21993

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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 21991 in words is "twenty-one thousand nine hundred ninety-one", meaning that:

21991 is not an aban number (as it contains the letter a)

21991 is not an eban number (as it contains the letter e)

21991 is not an iban number (as it contains the letter i)

21991 is not an oban number (as it contains the letter o)

21991 is not a tban number (as it contains the letter t)

21991 is not an uban number (as it contains the letter u)

Calculation was done in 0.0000028610 seconds

Numeral systems

How to write 21991 in other number systems?

Bengali numerals	২১৯৯১
Eastern Arabic numerals	٢١٬٩٩١
Hieroglyphs numeralsused in Ancient Egypt	𓂭𓂭𓆼𓍪𓎎𓏺
Khmer numerals	២១៩៩១
Japanese numerals	二万千九百九十一
Roman numerals	n/a
Thai numerals	๒๑๙๙๑

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Translation

How do you say 21991 in 38 different languages?

Arabic	واحد و عشرون ألف و تسعة مائة و واحد و تسعون
Croatian	dvadeset i jedna tisuća devetsto devedeset i jedan
Czech	dvacet jedna tisíc devět set devadesát jeden
Danish	en og tyve tusinde ni hundrede en og halvfems
Dutch	éénentwintigduizend negenhonderdéénennegentig
Estonian	akpe blaeve vɔ ɖekɛ alafa asieke blaasieke vɔ ɖekɛ
Faroese	tjúgoeitt tusin og níggjuhundraðognítiein
Filipino	dalawáng pû’t isáng libó’t siyám na daán at siyám na pû’t isá
Finnish	kaksikymmentäyksituhattayhdeksänsataayhdeksänkymmentäyksi
French	vingt et un mille neuf cent quatre-vingt-onze
Greek	είκοσι μία χίλιάδες εννιακόσια εννενήντα ένα
German	einundzwanzigtausendneunhunderteinundneunzig
Hebrew	עשרים ואחד אלף תשע מאות תשעים ואחת
Hindi	इक्कीस हज़ार नौ सौ इक्यानबे
Hungarian	huszonegyezerkilencszázkilencvenegy
Icelandic	tuttugu og eitt þúsund og níuhundrað og níutíu og einn
Indonesian	dua puluh satu ribu sembilan ratus sembilan puluh satu
Italian	ventunomilanovecentonovantuno
Japanese	二万千九百九十一
Korean	이만 천구백구십일
Latvian	divdesmit viens tūkstoši deviņsimt deviņdesmit viens
Lithuanian	dvidešimt vienas tūkstantis devyni šimtai devyniasdešimt vienas
Norwegian	tjueett tusen ni hundre og nittién
Persian	بیست و یک هزار و نهصد و نود و یک
Polish	dwadzieścia jeden tysięcy dziewięćset dziewięćdziesiąt jeden
Portuguese	vinte e um mil novecentos e noventa e um
Romanian	douăzeci şi una mii nouă sute nouăzeci şi unu
Russian	двадцать одна тысяча девятьсот девяносто один
Serbian	двадесет и једна хиљада деветсто деведесет и један
Slovak	dvadsaťjedna tisíc deväťsto deväťdesiatjeden
Slovene	dvaset ena tisuću devetsto devetdeset ena
Spanish	veintiún mil novecientos noventa y uno
Swahili	elfu ishirini na moja, mia tisa na tisini na moja
Swedish	tjugoentusenniohundranittioen
Thai	สองหมื่นหนึ่งพันเก้าร้อยเก้าสิบเอ็ด
Turkish	yirmi bir bin dokuz yüz doksan bir
Ukrainian	двадцять одна тисяча девʼятсот девʼяносто один
Vietnamese	hai mươi mốt nghìn chín trăm chín mươi mốt

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Miscellaneous

Number 21991 reversed	19912
Unicode Character	U+55E7	嗧
Unix Timestamp	Thu, 01 Jan 1970 06:06:31 +0000

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