21,012
21,012 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 6
- Digit product
- 0
- Digital root
- 6
- Palindrome
- Yes
- Bit width
- 15 bits
- Recamán's sequence
- a(41,815) = 21,012
- Square (n²)
- 441,504,144
- Cube (n³)
- 9,276,885,073,728
- Divisor count
- 24
- σ(n) — sum of divisors
- 52,416
- φ(n) — Euler's totient
- 6,528
- Sum of prime factors
- 127
Primality
Prime factorization: 2 2 × 3 × 17 × 103
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand twelve
- Ordinal
- 21012th
- Binary
- 101001000010100
- Octal
- 51024
- Hexadecimal
- 0x5214
- Base64
- UhQ=
- One's complement
- 44,523 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋 𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓎆𓏺𓏺
- Greek (Milesian)
- ͵καιβʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋪·𝋬
- Chinese
- 二萬一千零一十二
- Chinese (financial)
- 貳萬壹仟零壹拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,012 = 9
- e — Euler's number (e)
- Digit 21,012 = 9
- φ — Golden ratio (φ)
- Digit 21,012 = 3
- √2 — Pythagoras's (√2)
- Digit 21,012 = 6
- ln 2 — Natural log of 2
- Digit 21,012 = 8
- γ — Euler-Mascheroni (γ)
- Digit 21,012 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21012, here are decompositions:
- 11 + 21001 = 21012
- 29 + 20983 = 21012
- 31 + 20981 = 21012
- 53 + 20959 = 21012
- 73 + 20939 = 21012
- 83 + 20929 = 21012
- 109 + 20903 = 21012
- 113 + 20899 = 21012
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 88 94 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.20.
- Address
- 0.0.82.20
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.20
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21012 first appears in π at position 610,612 of the decimal expansion (the 610,612ordinal-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.