139,021
139,021 is a prime, odd.
139,021 (one hundred thirty-nine thousand twenty-one) is an odd 6-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in hexadecimal, 0x21F0D.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 6
- Digit sum
- 16
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 120,931
- Recamán's sequence
- a(490,785) = 139,021
- Square (n²)
- 19,326,838,441
- Cube (n³)
- 2,686,836,406,906,261
- Divisor count
- 2
- σ(n) — sum of divisors
- 139,022
- φ(n) — Euler's totient
- 139,020
Primality
139,021 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√139,021 = [372; (1, 5, 1, 9, 1, 1, 1, 4, 1, 2, 29, 2, 9, 5, 5, 2, 4, 1, 6, 1, 2, 1, 1, 13, …)]
Representations
- In words
- one hundred thirty-nine thousand twenty-one
- Ordinal
- 139021st
- Binary
- 100001111100001101
- Octal
- 417415
- Hexadecimal
- 0x21F0D
- Base64
- Ah8N
- One's complement
- 4,294,828,274 (32-bit)
- Scientific notation
- 1.39021 × 10⁵
- As a duration
- 139,021 s = 1 day, 14 hours, 37 minutes, 1 second
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓎆𓎆𓏺
- Greek (Milesian)
- ͵ρλθκαʹ
- Mayan (base 20)
- 𝋱·𝋧·𝋫·𝋡
- Chinese
- 一十三萬九千零二十一
- Chinese (financial)
- 壹拾參萬玖仟零貳拾壹
Also seen as
UTF-8 encoding: F0 A1 BC 8D (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.31.13.
- Address
- 0.2.31.13
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.31.13
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 139,021 and was likely granted around 1872.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.