21,130
21,130 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 7
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 3,112
- Recamán's sequence
- a(41,579) = 21,130
- Square (n²)
- 446,476,900
- Cube (n³)
- 9,434,056,897,000
- Divisor count
- 8
- σ(n) — sum of divisors
- 38,052
- φ(n) — Euler's totient
- 8,448
- Sum of prime factors
- 2,120
Primality
Prime factorization: 2 × 5 × 2113
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand one hundred thirty
- Ordinal
- 21130th
- Binary
- 101001010001010
- Octal
- 51212
- Hexadecimal
- 0x528A
- Base64
- Uoo=
- One's complement
- 44,405 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹 𒌋
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓎆𓎆𓎆
- Greek (Milesian)
- ͵καρλʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋰·𝋪
- Chinese
- 二萬一千一百三十
- Chinese (financial)
- 貳萬壹仟壹佰參拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,130 = 1
- e — Euler's number (e)
- Digit 21,130 = 8
- φ — Golden ratio (φ)
- Digit 21,130 = 1
- √2 — Pythagoras's (√2)
- Digit 21,130 = 3
- ln 2 — Natural log of 2
- Digit 21,130 = 4
- γ — Euler-Mascheroni (γ)
- Digit 21,130 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21130, here are decompositions:
- 23 + 21107 = 21130
- 29 + 21101 = 21130
- 41 + 21089 = 21130
- 71 + 21059 = 21130
- 107 + 21023 = 21130
- 113 + 21017 = 21130
- 149 + 20981 = 21130
- 167 + 20963 = 21130
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8A 8A (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.138.
- Address
- 0.0.82.138
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.138
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21130 first appears in π at position 104,811 of the decimal expansion (the 104,811ordinal-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.