21,404
21,404 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 11
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 40,412
- Recamán's sequence
- a(41,031) = 21,404
- Square (n²)
- 458,131,216
- Cube (n³)
- 9,805,840,547,264
- Divisor count
- 6
- σ(n) — sum of divisors
- 37,464
- φ(n) — Euler's totient
- 10,700
- Sum of prime factors
- 5,355
Primality
Prime factorization: 2 2 × 5351
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty-one thousand four hundred four
- Ordinal
- 21404th
- Binary
- 101001110011100
- Octal
- 51634
- Hexadecimal
- 0x539C
- Base64
- U5w=
- One's complement
- 44,131 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καυδʹ
- Mayan (base 20)
- 𝋢·𝋭·𝋪·𝋤
- Chinese
- 二萬一千四百零四
- Chinese (financial)
- 貳萬壹仟肆佰零肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,404 = 4
- e — Euler's number (e)
- Digit 21,404 = 6
- φ — Golden ratio (φ)
- Digit 21,404 = 6
- √2 — Pythagoras's (√2)
- Digit 21,404 = 4
- ln 2 — Natural log of 2
- Digit 21,404 = 0
- γ — Euler-Mascheroni (γ)
- Digit 21,404 = 8
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 21404, here are decompositions:
- 3 + 21401 = 21404
- 7 + 21397 = 21404
- 13 + 21391 = 21404
- 127 + 21277 = 21404
- 157 + 21247 = 21404
- 193 + 21211 = 21404
- 211 + 21193 = 21404
- 241 + 21163 = 21404
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 8E 9C (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.83.156.
- Address
- 0.0.83.156
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.83.156
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21404 first appears in π at position 24,646 of the decimal expansion (the 24,646ordinal-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.