21,742
21,742 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 16
- Digit product
- 112
- Digital root
- 7
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 24,712
- Recamán's sequence
- a(40,355) = 21,742
- Square (n²)
- 472,714,564
- Cube (n³)
- 10,277,760,050,488
- Divisor count
- 8
- σ(n) — sum of divisors
- 37,296
- φ(n) — Euler's totient
- 9,312
- Sum of prime factors
- 1,562
Primality
Prime factorization: 2 × 7 × 1553
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand seven hundred forty-two
- Ordinal
- 21742nd
- Binary
- 101010011101110
- Octal
- 52356
- Hexadecimal
- 0x54EE
- Base64
- VO4=
- One's complement
- 43,793 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹 𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵καψμβʹ
- Mayan (base 20)
- 𝋢·𝋮·𝋧·𝋢
- Chinese
- 二萬一千七百四十二
- Chinese (financial)
- 貳萬壹仟柒佰肆拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,742 = 4
- e — Euler's number (e)
- Digit 21,742 = 4
- φ — Golden ratio (φ)
- Digit 21,742 = 1
- √2 — Pythagoras's (√2)
- Digit 21,742 = 9
- ln 2 — Natural log of 2
- Digit 21,742 = 9
- γ — Euler-Mascheroni (γ)
- Digit 21,742 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21742, here are decompositions:
- 3 + 21739 = 21742
- 5 + 21737 = 21742
- 29 + 21713 = 21742
- 41 + 21701 = 21742
- 59 + 21683 = 21742
- 131 + 21611 = 21742
- 173 + 21569 = 21742
- 179 + 21563 = 21742
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 93 AE (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.84.238.
- Address
- 0.0.84.238
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.84.238
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21742 first appears in π at position 20,465 of the decimal expansion (the 20,465ordinal-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.