421983921 has 16 divisors (see below), whose sum is σ = 588487680. Its totient is φ = 268458960.

The previous prime is 421983883. The next prime is 421983937. The reversal of 421983921 is 129389124.

It is not a de Polignac number, because 421983921 - 2²³ = 413595313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421983921.

It is not an unprimeable number, because it can be changed into a prime (421983971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23326 + ... + 37256.

It is an arithmetic number, because the mean of its divisors is an integer number (36780480).

Almost surely, 2^421983921 is an apocalyptic number.

It is an amenable number.

421983921 is a deficient number, since it is larger than the sum of its proper divisors (166503759).

421983921 is a wasteful number, since it uses less digits than its factorization.

421983921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14396.

The product of its digits is 31104, while the sum is 39.

The square root of 421983921 is about 20542.2472237095. The cubic root of 421983921 is about 750.0645402237.

The spelling of 421983921 in words is "four hundred twenty-one million, nine hundred eighty-three thousand, nine hundred twenty-one".