21,140
21,140 is a composite number, even.
21,140 (twenty-one thousand one hundred forty) is an even 5-digit number. It is a composite number with 24 divisors, and factors as 2² × 5 × 7 × 151. Its proper divisors sum to 29,932, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x5294.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 8
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 4,112
- Recamán's sequence
- a(41,559) = 21,140
- Square (n²)
- 446,899,600
- Cube (n³)
- 9,447,457,544,000
- Divisor count
- 24
- σ(n) — sum of divisors
- 51,072
- φ(n) — Euler's totient
- 7,200
- Sum of prime factors
- 167
Primality
Prime factorization: 2 2 × 5 × 7 × 151
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√21,140 = [145; (2, 1, 1, 9, 2, 2, 1, 17, 2, 6, 8, 6, 2, 17, 1, 2, 2, 9, 1, 1, 2, 290)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- twenty-one thousand one hundred forty
- Ordinal
- 21140th
- Binary
- 101001010010100
- Octal
- 51224
- Hexadecimal
- 0x5294
- Base64
- UpQ=
- One's complement
- 44,395 (16-bit)
- Scientific notation
- 2.114 × 10⁴
- As a duration
- 21,140 s = 5 hours, 52 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵καρμʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋱·𝋠
- Chinese
- 二萬一千一百四十
- Chinese (financial)
- 貳萬壹仟壹佰肆拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,140 = 6
- e — Euler's number (e)
- Digit 21,140 = 7
- φ — Golden ratio (φ)
- Digit 21,140 = 3
- √2 — Pythagoras's (√2)
- Digit 21,140 = 4
- ln 2 — Natural log of 2
- Digit 21,140 = 0
- γ — Euler-Mascheroni (γ)
- Digit 21,140 = 1
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21140, here are decompositions:
- 19 + 21121 = 21140
- 73 + 21067 = 21140
- 79 + 21061 = 21140
- 109 + 21031 = 21140
- 127 + 21013 = 21140
- 139 + 21001 = 21140
- 157 + 20983 = 21140
- 181 + 20959 = 21140
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8A 94 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.148.
- Address
- 0.0.82.148
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.148
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21140 first appears in π at position 52,282 of the decimal expansion (the 52,282ordinal-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.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.