21,109
21,109 is a composite number, odd.
21,109 (twenty-one thousand one hundred nine) is an odd 5-digit number. It is a composite number with 8 divisors, and factors as 11 × 19 × 101. Written other ways, in hexadecimal, 0x5275.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 13
- Digit product
- 0
- Digital root
- 4
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 90,112
- Recamán's sequence
- a(41,621) = 21,109
- Square (n²)
- 445,589,881
- Cube (n³)
- 9,405,956,798,029
- Divisor count
- 8
- σ(n) — sum of divisors
- 24,480
- φ(n) — Euler's totient
- 18,000
- Sum of prime factors
- 131
Primality
Prime factorization: 11 × 19 × 101
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√21,109 = [145; (3, 2, 5, 6, 3, 1, 1, 1, 21, 1, 2, 1, 1, 72, 13, 1, 4, 1, 1, 1, 14, 1, 1, 1, …)]
Period length 42 — the block in parentheses repeats forever.
Representations
- In words
- twenty-one thousand one hundred nine
- Ordinal
- 21109th
- Binary
- 101001001110101
- Octal
- 51165
- Hexadecimal
- 0x5275
- Base64
- UnU=
- One's complement
- 44,426 (16-bit)
- Scientific notation
- 2.1109 × 10⁴
- As a duration
- 21,109 s = 5 hours, 51 minutes, 49 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓍢𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵καρθʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋯·𝋩
- Chinese
- 二萬一千一百零九
- Chinese (financial)
- 貳萬壹仟壹佰零玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 21,109 = 5
- e — Euler's number (e)
- Digit 21,109 = 5
- φ — Golden ratio (φ)
- Digit 21,109 = 8
- √2 — Pythagoras's (√2)
- Digit 21,109 = 4
- ln 2 — Natural log of 2
- Digit 21,109 = 2
- γ — Euler-Mascheroni (γ)
- Digit 21,109 = 6
Also seen as
UTF-8 encoding: E5 89 B5 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.117.
- Address
- 0.0.82.117
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.82.117
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 21109 first appears in π at position 214,185 of the decimal expansion (the 214,185ordinal-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.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.