21,406
21,406 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 13
- Digit product
- 0
- Digital root
- 4
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 60,412
- Recamán's sequence
- a(41,027) = 21,406
- Square (n²)
- 458,216,836
- Cube (n³)
- 9,808,589,591,416
- Divisor count
- 16
- σ(n) — sum of divisors
- 40,320
- φ(n) — Euler's totient
- 8,280
- Sum of prime factors
- 159
Primality
Prime factorization: 2 × 7 × 11 × 139
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand four hundred six
- Ordinal
- 21406th
- Binary
- 101001110011110
- Octal
- 51636
- Hexadecimal
- 0x539E
- Base64
- U54=
- One's complement
- 44,129 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καυϛʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋪·𝋦
- Chinese
- 二萬一千四百零六
- Chinese (financial)
- 貳萬壹仟肆佰零陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,406 = 5
- e — Euler's number (e)
- Digit 21,406 = 0
- φ — Golden ratio (φ)
- Digit 21,406 = 7
- √2 — Pythagoras's (√2)
- Digit 21,406 = 9
- ln 2 — Natural log of 2
- Digit 21,406 = 9
- γ — Euler-Mascheroni (γ)
- Digit 21,406 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21406, here are decompositions:
- 5 + 21401 = 21406
- 23 + 21383 = 21406
- 29 + 21377 = 21406
- 59 + 21347 = 21406
- 83 + 21323 = 21406
- 89 + 21317 = 21406
- 137 + 21269 = 21406
- 179 + 21227 = 21406
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8E 9E (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.83.158.
- Address
- 0.0.83.158
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.83.158
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21406 first appears in π at position 20,090 of the decimal expansion (the 20,090ordinal-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.