The number 221

Representation numerals

Greek numeral

σκαʹ

Arabic numeral

٢٢١

Roman numeral

CCXXI

Maya numeral


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Chinese numeral

二百二十一

Hebrew numeral

רכא
Numeral systems
Binary: 11011101
Septimal (base 7): 434
Octal: 335
Hexadecimal: dd
Base 24: 95
Factorization
221 = 13 × 17
221 has 4 divisors: 1, 13, 17, 221
Sum of all divisors other than 221: 31
Sums & differences
Sum of 2 squares: 221 = 112 + 102 = 142 + 52
Difference of 2 squares: 221 = 152 - 22 = 1112 - 1102
Characteristics
221 is a palindromic number in septimal system (434)
Related primes
The 221th prime number is: 1381
Previous prime number: 211 — Next prime number: 223
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