21,108
21,108 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 12
- Digit product
- 0
- Digital root
- 3
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 80,112
- Recamán's sequence
- a(41,623) = 21,108
- Square (n²)
- 445,547,664
- Cube (n³)
- 9,404,620,091,712
- Divisor count
- 12
- σ(n) — sum of divisors
- 49,280
- φ(n) — Euler's totient
- 7,032
- Sum of prime factors
- 1,766
Primality
Prime factorization: 2 2 × 3 × 1759
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand one hundred eight
- Ordinal
- 21108th
- Binary
- 101001001110100
- Octal
- 51164
- Hexadecimal
- 0x5274
- Base64
- UnQ=
- One's complement
- 44,427 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καρηʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋯·𝋨
- Chinese
- 二萬一千一百零八
- Chinese (financial)
- 貳萬壹仟壹佰零捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,108 = 8
- e — Euler's number (e)
- Digit 21,108 = 9
- φ — Golden ratio (φ)
- Digit 21,108 = 9
- √2 — Pythagoras's (√2)
- Digit 21,108 = 3
- ln 2 — Natural log of 2
- Digit 21,108 = 4
- γ — Euler-Mascheroni (γ)
- Digit 21,108 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21108, here are decompositions:
- 7 + 21101 = 21108
- 19 + 21089 = 21108
- 41 + 21067 = 21108
- 47 + 21061 = 21108
- 89 + 21019 = 21108
- 97 + 21011 = 21108
- 107 + 21001 = 21108
- 127 + 20981 = 21108
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 89 B4 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.116.
- Address
- 0.0.82.116
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.116
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21108 first appears in π at position 90,796 of the decimal expansion (the 90,796ordinal-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.