421657238972 has 12 divisors (see below), whose sum is σ = 741645855720. Its totient is φ = 209758423056.

The previous prime is 421657238969. The next prime is 421657239041. The reversal of 421657238972 is 279832756124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267548222 + ... + 267549797.

It is an arithmetic number, because the mean of its divisors is an integer number (61803821310).

Almost surely, 2^421657238972 is an apocalyptic number.

It is an amenable number.

421657238972 is a deficient number, since it is larger than the sum of its proper divisors (319988616748).

421657238972 is a wasteful number, since it uses less digits than its factorization.

421657238972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535098220 (or 535098218 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 56.

The spelling of 421657238972 in words is "four hundred twenty-one billion, six hundred fifty-seven million, two hundred thirty-eight thousand, nine hundred seventy-two".