Number
21,013
21,013 is a prime, odd.
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 7
- Digital root
- 7
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 21,014
Primality
21,013 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
Representations
- In words
- twenty-one thousand thirteen
- Ordinal
- 21013th
- Binary
- 101001000010101
- Octal
- 51025
- Hexadecimal
- 5215
Also seen as
Prime neighborhood
Unicode codepoint
刕
U+5215
Other letter (Lo)
UTF-8 encoding: E5 88 95 (3 bytes).
Hex color
#005215
RGB(0, 82, 21)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.82.21.