MathQuarryCalculators

Primes / Is 221 prime?

Is 221 a Prime Number?

No221 = 13 x 17

221 is NOT prime: 13 × 17 = 221. That makes 13 a genuine divisor of 221 beyond 1 and 221 itself. Fully broken down, 221 = 13 × 17, for 4 divisors total. 221 sits between primes 211 and 223, 10 below and 2 above. 221 shares no factor with 2-12; 221's divisors start beyond that range. 221 is odd, digit sum 5 for 221, digital root 5 for 221. 221 has 4 primes within 10 of 221.

Factors
1, 13, 17, 221
Number of factors
4
Prime?
No
Prime factorization
13 x 17
Even or odd
Odd
Square
48841
Cube
10793861
Binary
11011101
Hexadecimal
DD
Roman numeral
CCXXI
Perfect square?
No
Perfect cube?
No
Perfect number?
No
Triangular number?
No
Fibonacci number?
No
Full facts for 221 →Factors of 221 →