Number
21,061
21,061 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 10
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 16,012
- Recamán's sequence
- a(41,717) = 21,061
- Square (n²)
- 443,565,721
- Cube (n³)
- 9,341,937,649,981
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,062
- φ(n) — Euler's totient
- 21,060
Primality
21,061 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
21,061
·
42,122
(double)
·
63,183
·
84,244
·
105,305
·
126,366
·
147,427
·
168,488
·
189,549
·
210,610
Sums & aliquot sequence
As a sum of two squares:
6² + 145²
As consecutive integers:
10,530 + 10,531
Representations
- In words
- twenty-one thousand sixty-one
- Ordinal
- 21061st
- Binary
- 101001001000101
- Octal
- 51105
- Hexadecimal
- 0x5245
- Base64
- UkU=
- One's complement
- 44,474 (16-bit)
In other bases
ternary (3)
1001220001
quaternary (4)
11021011
quinary (5)
1133221
senary (6)
241301
septenary (7)
115255
nonary (9)
31801
undecimal (11)
14907
duodecimal (12)
10231
tridecimal (13)
9781
tetradecimal (14)
7965
pentadecimal (15)
6391
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹 𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵καξαʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋭·𝋡
- Chinese
- 二萬一千零六十一
- Chinese (financial)
- 貳萬壹仟零陸拾壹
In other modern scripts
Eastern Arabic
٢١٠٦١
Devanagari
२१०६१
Bengali
২১০৬১
Tamil
௨௧௦௬௧
Thai
๒๑๐๖๑
Tibetan
༢༡༠༦༡
Khmer
២១០៦១
Lao
໒໑໐໖໑
Burmese
၂၁၀၆၁
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,061 = 6
- e — Euler's number (e)
- Digit 21,061 = 5
- φ — Golden ratio (φ)
- Digit 21,061 = 7
- √2 — Pythagoras's (√2)
- Digit 21,061 = 3
- ln 2 — Natural log of 2
- Digit 21,061 = 8
- γ — Euler-Mascheroni (γ)
- Digit 21,061 = 6
Also seen as
Prime neighborhood
Unicode codepoint
剅
CJK Unified Ideograph-5245
U+5245
Other letter (Lo)
UTF-8 encoding: E5 89 85 (3 bytes).
Hex color
#005245
RGB(0, 82, 69)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.69.
- Address
- 0.0.82.69
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.69
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 21061 first appears in π at position 91,698 of the decimal expansion (the 91,698ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.