Number
221
221 is a composite number, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 5
- Digital root
- 5
- Palindrome
- No
- Divisor count
- 4
- σ(n) — sum of divisors
- 252
Primality
Prime factorization: 13 × 17
Divisors & multiples
Aliquot sum (sum of proper divisors):
31
Representations
- In words
- two hundred twenty-one
- Ordinal
- 221st
- Roman numeral
- CCXXI
- Binary
- 11011101
- Octal
- 335
- Hexadecimal
- DD
Also seen as
Unicode codepoint
Ý
U+00DD
Uppercase letter (Lu)
UTF-8 encoding: C3 9D (2 bytes).
Hex color
#0000DD
RGB(0, 0, 221)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.221.