21,389
21,389 is a composite number, odd.
21,389 (twenty-one thousand three hundred eighty-nine) is an odd 5-digit number. It is a composite number with 4 divisors, and factors as 73 × 293. Written other ways, in hexadecimal, 0x538D.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 23
- Digit product
- 432
- Digital root
- 5
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 98,312
- Recamán's sequence
- a(41,061) = 21,389
- Square (n²)
- 457,489,321
- Cube (n³)
- 9,785,239,086,869
- Divisor count
- 4
- σ(n) — sum of divisors
- 21,756
- φ(n) — Euler's totient
- 21,024
- Sum of prime factors
- 366
Primality
Prime factorization: 73 × 293
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√21,389 = [146; (4, 292)]
Period length 2 — the block in parentheses repeats forever.
Representations
- In words
- twenty-one thousand three hundred eighty-nine
- Ordinal
- 21389th
- Binary
- 101001110001101
- Octal
- 51615
- Hexadecimal
- 0x538D
- Base64
- U40=
- One's complement
- 44,146 (16-bit)
- Scientific notation
- 2.1389 × 10⁴
- As a duration
- 21,389 s = 5 hours, 56 minutes, 29 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵κατπθʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋩·𝋩
- Chinese
- 二萬一千三百八十九
- Chinese (financial)
- 貳萬壹仟參佰捌拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,389 = 4
- e — Euler's number (e)
- Digit 21,389 = 1
- φ — Golden ratio (φ)
- Digit 21,389 = 9
- √2 — Pythagoras's (√2)
- Digit 21,389 = 8
- ln 2 — Natural log of 2
- Digit 21,389 = 9
- γ — Euler-Mascheroni (γ)
- Digit 21,389 = 0
Also seen as
UTF-8 encoding: E5 8E 8D (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.83.141.
- Address
- 0.0.83.141
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.83.141
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21389 first appears in π at position 19,226 of the decimal expansion (the 19,226ordinal-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.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.