21,061
21,061 is a prime, odd.
21,061 (twenty-one thousand sixty-one) is an odd 5-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x5245.
Interestingness
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
Sums & aliquot sequence
Continued fraction of √n
√21,061 = [145; (8, 16, 1, 18, 2, 2, 4, 2, 3, 2, 1, 2, 2, 1, 3, 1, 1, 1, 2, 3, 1, 4, 1, 4, …)]
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)
- Scientific notation
- 2.1061 × 10⁴
- As a duration
- 21,061 s = 5 hours, 51 minutes, 1 second
As an angle
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
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
UTF-8 encoding: E5 89 85 (3 bytes).
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.
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.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.