21,480
21,480 is a composite number, even.
21,480 (twenty-one thousand four hundred eighty) is an even 5-digit number. It is a composite number with 32 divisors, and factors as 2³ × 3 × 5 × 179. Its proper divisors sum to 43,320, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x53E8.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 15
- Digit product
- 0
- Digital root
- 6
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 8,412
- Recamán's sequence
- a(40,879) = 21,480
- Square (n²)
- 461,390,400
- Cube (n³)
- 9,910,665,792,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 64,800
- φ(n) — Euler's totient
- 5,696
- Sum of prime factors
- 193
Primality
Prime factorization: 2 3 × 3 × 5 × 179
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√21,480 = [146; (1, 1, 3, 1, 1, 1, 2, 5, 1, 1, 1, 1, 11, 1, 1, 1, 1, 5, 2, 1, 1, 1, 3, 1, …)]
Period length 26 — the block in parentheses repeats forever.
Representations
- In words
- twenty-one thousand four hundred eighty
- Ordinal
- 21480th
- Binary
- 101001111101000
- Octal
- 51750
- Hexadecimal
- 0x53E8
- Base64
- U+g=
- One's complement
- 44,055 (16-bit)
- Scientific notation
- 2.148 × 10⁴
- As a duration
- 21,480 s = 5 hours, 58 minutes
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 ·
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵καυπʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋮·𝋠
- Chinese
- 二萬一千四百八十
- Chinese (financial)
- 貳萬壹仟肆佰捌拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,480 = 9
- e — Euler's number (e)
- Digit 21,480 = 7
- φ — Golden ratio (φ)
- Digit 21,480 = 9
- √2 — Pythagoras's (√2)
- Digit 21,480 = 2
- ln 2 — Natural log of 2
- Digit 21,480 = 3
- γ — Euler-Mascheroni (γ)
- Digit 21,480 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21480, here are decompositions:
- 13 + 21467 = 21480
- 47 + 21433 = 21480
- 61 + 21419 = 21480
- 73 + 21407 = 21480
- 79 + 21401 = 21480
- 83 + 21397 = 21480
- 89 + 21391 = 21480
- 97 + 21383 = 21480
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8F A8 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.83.232.
- Address
- 0.0.83.232
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.83.232
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21480 first appears in π at position 102 of the decimal expansion (the 102ordinal-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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.