221, 442, 663, 884 and so on.
Apart from itself and 1, the only numbers that divide evenly into 221 are 13 and 17. Therefore, 221 = 13 x 17.
The prime factors of 221 are 13 and 17. They're the only prime numbers that will divide evenly into 221 with no remainder.
1, 13, 17, 221.
1, 13, 17 and 221.
13 x 17 = 221
1, 13, 17, 221
221
13 times 17 = 221
73.6667
There are no two primes whose sum is 221.
It is: 13
It is 13 because it is the HCF of 325 and 221