21,142
21,142 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 10
- Digit product
- 16
- Digital root
- 1
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 24,112
- Recamán's sequence
- a(41,555) = 21,142
- Square (n²)
- 446,984,164
- Cube (n³)
- 9,450,139,195,288
- Divisor count
- 12
- σ(n) — sum of divisors
- 35,748
- φ(n) — Euler's totient
- 9,300
- Sum of prime factors
- 75
Primality
Prime factorization: 2 × 11 × 31 2
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand one hundred forty-two
- Ordinal
- 21142nd
- Binary
- 101001010010110
- Octal
- 51226
- Hexadecimal
- 0x5296
- Base64
- UpY=
- One's complement
- 44,393 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹 𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵καρμβʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋱·𝋢
- Chinese
- 二萬一千一百四十二
- Chinese (financial)
- 貳萬壹仟壹佰肆拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,142 = 1
- e — Euler's number (e)
- Digit 21,142 = 2
- φ — Golden ratio (φ)
- Digit 21,142 = 8
- √2 — Pythagoras's (√2)
- Digit 21,142 = 6
- ln 2 — Natural log of 2
- Digit 21,142 = 2
- γ — Euler-Mascheroni (γ)
- Digit 21,142 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21142, here are decompositions:
- 3 + 21139 = 21142
- 41 + 21101 = 21142
- 53 + 21089 = 21142
- 83 + 21059 = 21142
- 131 + 21011 = 21142
- 179 + 20963 = 21142
- 239 + 20903 = 21142
- 263 + 20879 = 21142
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8A 96 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.150.
- Address
- 0.0.82.150
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.150
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21142 first appears in π at position 127,413 of the decimal expansion (the 127,413ordinal-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.