21,398
21,398 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 23
- Digit product
- 432
- Digital root
- 5
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 89,312
- Recamán's sequence
- a(41,043) = 21,398
- Square (n²)
- 457,874,404
- Cube (n³)
- 9,797,596,496,792
- Divisor count
- 8
- σ(n) — sum of divisors
- 34,608
- φ(n) — Euler's totient
- 9,864
- Sum of prime factors
- 838
Primality
Prime factorization: 2 × 13 × 823
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand three hundred ninety-eight
- Ordinal
- 21398th
- Binary
- 101001110010110
- Octal
- 51626
- Hexadecimal
- 0x5396
- Base64
- U5Y=
- One's complement
- 44,137 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵κατϟηʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋩·𝋲
- Chinese
- 二萬一千三百九十八
- Chinese (financial)
- 貳萬壹仟參佰玖拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,398 = 1
- e — Euler's number (e)
- Digit 21,398 = 2
- φ — Golden ratio (φ)
- Digit 21,398 = 3
- √2 — Pythagoras's (√2)
- Digit 21,398 = 1
- ln 2 — Natural log of 2
- Digit 21,398 = 9
- γ — Euler-Mascheroni (γ)
- Digit 21,398 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21398, here are decompositions:
- 7 + 21391 = 21398
- 19 + 21379 = 21398
- 79 + 21319 = 21398
- 151 + 21247 = 21398
- 211 + 21187 = 21398
- 229 + 21169 = 21398
- 241 + 21157 = 21398
- 277 + 21121 = 21398
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8E 96 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.83.150.
- Address
- 0.0.83.150
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.83.150
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21398 first appears in π at position 112,721 of the decimal expansion (the 112,721ordinal-suffix:st 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.