Number
1,221
1,221 is a composite number, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 6
- Digital root
- 6
- Palindrome
- Yes
- Divisor count
- 8
- σ(n) — sum of divisors
- 1,824
Primality
Prime factorization: 3 × 11 × 37
Divisors & multiples
Aliquot sum (sum of proper divisors):
603
First multiples
Representations
- In words
- one thousand two hundred twenty-one
- Ordinal
- 1221st
- Roman numeral
- MCCXXI
- Binary
- 10011000101
- Octal
- 2305
- Hexadecimal
- 4C5
Also seen as
Unicode codepoint
Ӆ
U+04C5
Uppercase letter (Lu)
UTF-8 encoding: D3 85 (2 bytes).
Hex color
#0004C5
RGB(0, 4, 197)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.197.