Factors / Factors of 221

Factors of 221

1, 13, 17, 221

221 breaks into 2 pairs, tested up to √221 ≈ 14.9; each pair multiplies back to 221 exactly. 221's full pair list is (1, 221), (13, 17), for 4 divisors in total. 221's divisors other than 221 itself sum to just 31, 190 below 221: the common deficient case. 221 is odd, digit sum 5 for 221; none of 2-12 divide 221 evenly. 221 has 4 divisors; 220 has 12 and 222 has 8, so 220 wins here. 221 divided by its largest divisor, 17, gives 13.