21,998
21,998 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 29
- Digit product
- 1,296
- Digital root
- 2
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 89,912
- Recamán's sequence
- a(167,767) = 21,998
- Square (n²)
- 483,912,004
- Cube (n³)
- 10,645,096,263,992
- Divisor count
- 8
- σ(n) — sum of divisors
- 34,992
- φ(n) — Euler's totient
- 10,336
- Sum of prime factors
- 666
Primality
Prime factorization: 2 × 17 × 647
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand nine hundred ninety-eight
- Ordinal
- 21998th
- Binary
- 101010111101110
- Octal
- 52756
- Hexadecimal
- 0x55EE
- Base64
- Ve4=
- One's complement
- 43,537 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καϡϟηʹ
- Mayan (base 20)
- 𝋢·𝋮·𝋳·𝋲
- Chinese
- 二萬一千九百九十八
- Chinese (financial)
- 貳萬壹仟玖佰玖拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,998 = 9
- e — Euler's number (e)
- Digit 21,998 = 2
- φ — Golden ratio (φ)
- Digit 21,998 = 2
- √2 — Pythagoras's (√2)
- Digit 21,998 = 6
- ln 2 — Natural log of 2
- Digit 21,998 = 1
- γ — Euler-Mascheroni (γ)
- Digit 21,998 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21998, here are decompositions:
- 7 + 21991 = 21998
- 37 + 21961 = 21998
- 61 + 21937 = 21998
- 127 + 21871 = 21998
- 139 + 21859 = 21998
- 157 + 21841 = 21998
- 181 + 21817 = 21998
- 199 + 21799 = 21998
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 97 AE (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.85.238.
- Address
- 0.0.85.238
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.85.238
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21998 first appears in π at position 52,162 of the decimal expansion (the 52,162ordinal-suffix:nd 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.