Factors / Factors of 321

Factors of 321

1, 3, 107, 321

321 breaks into 2 pairs, tested up to √321 ≈ 17.9; each pair multiplies back to 321 exactly. 321's full pair list is (1, 321), (3, 107), for 4 divisors in total. 321's divisors other than 321 itself sum to just 111, 210 below 321: the common deficient case. 321 is odd, digit sum 6 for 321; small divisors of 321 include 3. 321 has 4 divisors; 320 has 14 and 322 has 8, so 320 wins here. 321 divided by its largest divisor, 107, gives 3.