21821

Number 21821 is an odd five-digits prime number and natural number following 21820 and preceding 21822.

Properties of the number 21821

Nominal	21821
Cardinal	twenty-one thousand eight hundred twenty-one
Cardinal twenty-one thousand eight hundred twenty-one
Ordinal	21,821st
Number of digits	5
Sum of digits	14
Product of digits	32
Number parity	Odd

Previous number is 21820

Next number is 21822

Calculation was done in 0.0000400543 seconds

Prime Factorization of 21821

Prime factorization	21821
Prime factors	21821
Number of distinct prime factors ω(n)	1
Total number of prime factors Ω(n)	1
Sum of prime factors	21821
Product of prime factors	21821

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Divisors of 21821

List of proper divisors	1
List of all dividers	1, 21821
Number of divisors d(n)	2
Sum of all divisors σ(n)	21822
Aliquot sum	1
21821 is a deficient number , since it is larger than the sum of its proper divisors (1). Its deficiency is 21820.

Calculation was done in 0.0000259876 seconds

Prime numbers

Is 21821 a prime number?	Yes
Is 21821 a semiprime number?	No
Is 21821 a Chen prime number?	Yes
Is 21821 a Mersenne prime number?	No

Previous prime is 21817

Next prime is 21839

Calculation was done in 0.1831769943 seconds

Sequences

Is 21821 a Catalan number?	No
Is 21821 a Fibonacci number?	No
Is 21821 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.

21821 is not a Happy number

21821 is not a Humble number

21821 is not a Münchhausen number

21821 is not a Perfect number

21821 is not a Perfect square

21821 is not a Palindrome

Calculation was done in 0.0090758801 seconds

Numeric Bases of 21821

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	101010100111101₂
3	Ternary	1002221012₃
4	Quaternary	11110331₄
5	Quinary	1144241₅
6	Senary	245005₆
7	Septenary	120422₇
8	Octal	52475₈
9	Nonary	32835₉
10	Decimal	21821
12	Duodecimal	10765₁₂
16	Hexadecimal	553d₁₆
20	Vigesimal	2eb1₂₀
36	Base36	gu5₃₆
60	Sexagesimal	63f₆₀

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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 21821 (n²)	476156041
Cube of 21821 (n³)	10390200970661
Square root of 21821	147.71932845772
Natural Logarithm (ln) of 21821	9.9906280878511
Decimal Logarithm (log) of 21821	4.3388746493014

Calculation was done in 0.0000059605 seconds

Trigonometry

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

Sine of 21821	-0.48168094786488
Cosecant of 21821	-2.0760630131473
Cosine of 21821	0.87634665770116
Secant of 21821	1.1411009458554
Tangent of 21821	-0.54964658520913
Cotangent of 21821	-1.8193508827486

Calculation was done in 0.0000228882 seconds

Number parity

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

Is 21821 an Even Number?

Is 21821 an Odd Number?

Yes, the number 21821 is an odd number.

Total number of all odd numbers from 1 to 21821 is 10911

Sum of all the odd numbers from 1 to 21821 are 119049921

The sum of all odd numbers is a perfect square: 119049921 = 10911

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 21819

Next odd number is 21823

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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 21821 in words is "twenty-one thousand eight hundred twenty-one", meaning that:

21821 is not an aban number (as it contains the letter a)

21821 is not an eban number (as it contains the letter e)

21821 is not an iban number (as it contains the letter i)

21821 is not an oban number (as it contains the letter o)

21821 is not a tban number (as it contains the letter t)

21821 is not an uban number (as it contains the letter u)

Calculation was done in 0.0000019073 seconds

Numeral systems

How to write 21821 in other number systems?

Bengali numerals	২১৮২১
Eastern Arabic numerals	٢١٬٨٢١
Hieroglyphs numeralsused in Ancient Egypt	𓂭𓂭𓆼𓍩𓎇𓏺
Khmer numerals	២១៨២១
Japanese numerals	二万千八百二十一
Roman numerals	n/a
Thai numerals	๒๑๘๒๑

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Translation

How do you say 21821 in 38 different languages?

Arabic	واحد و عشرون ألف و ثمانية مائة و واحد و عشرون
Croatian	dvadeset i jedna tisuća osamsto dvadeset i jedan
Czech	dvacet jedna tisíc osm set dvacet jeden
Danish	en og tyve tusinde otte hundrede en og tyve
Dutch	éénentwintigduizend achthonderdéénentwintig
Estonian	akpe blaeve vɔ ɖekɛ alafa enyi blaeve vɔ ɖekɛ
Faroese	tjúgoeitt tusin og áttahundraðogtjúgoein
Filipino	dalawáng pû’t isáng libó’t walóng daán at dalawáng pû’t isá
Finnish	kaksikymmentäyksituhattakahdeksansataakaksikymmentäyksi
French	vingt et un mille huit cent vingt et un
Greek	είκοσι μία χίλιάδες οκτακόσια είκοσι ένα
German	einundzwanzigtausendachthunderteinundzwanzig
Hebrew	עשרים ואחד אלף שמונה מאות עשרים ואחת
Hindi	इक्कीस हज़ार आठ सौ इक्कीस
Hungarian	huszonegyezernyolcszázhuszonegy
Icelandic	tuttugu og eitt þúsund og áttahundrað og tuttugu og einn
Indonesian	dua puluh satu ribu delapan ratus dua puluh satu
Italian	ventunomilaottocentoventuno
Japanese	二万千八百二十一
Korean	이만 천팔백이십일
Latvian	divdesmit viens tūkstoši astoņsimt divdesmit viens
Lithuanian	dvidešimt vienas tūkstantis aštuoni šimtai dvidešimt vienas
Norwegian	tjueett tusen åtte hundre og tjueén
Persian	بیست و یک هزار و هشتصد و بیست و یک
Polish	dwadzieścia jeden tysięcy osiemset dwadzieścia jeden
Portuguese	vinte e um mil oitocentos e vinte e um
Romanian	douăzeci şi una mii opt sute douăzeci şi unu
Russian	двадцать одна тысяча восемьсот двадцать один
Serbian	двадесет и једна хиљада осамсто двадесет и један
Slovak	dvadsaťjedna tisíc osemsto dvadsaťjeden
Slovene	dvaset ena tisuću osemsto dvaset ena
Spanish	veintiún mil ochocientos veintiuno
Swahili	elfu ishirini na moja, mia nane na ishirini na moja
Swedish	tjugoentusenåttahundratjugoen
Thai	สองหมื่นหนึ่งพันแปดร้อยยี่สิบเอ็ด
Turkish	yirmi bir bin sekiz yüz yirmi bir
Ukrainian	двадцять одна тисяча вісімсот двадцять один
Vietnamese	hai mươi mốt nghìn tám trăm hai mươi mốt

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Miscellaneous

Number 21821 reversed	12812
Unicode Character	U+553D	唽
Unix Timestamp	Thu, 01 Jan 1970 06:03:41 +0000

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