Factors / Factors of 421

Factors of 421

1, 421

421 is prime: only factor pair is (1, 421), confirmed by trial division up to √421 ≈ 20.5 turning up nothing else. 421's full pair list is (1, 421), for 2 divisors in total. 421's divisors other than 421 itself sum to just 1, 420 below 421: the common deficient case. 421 is odd, digit sum 7 for 421; none of 2-12 divide 421 evenly. 421 has 2 divisors; 420 has 24 and 422 has 4, so 420 wins here. 421 divided by its largest divisor, 1, gives 421.