421908612172 has 6 divisors (see below), whose sum is σ = 738340071308. Its totient is φ = 210954306084.

The previous prime is 421908612163. The next prime is 421908612173. The reversal of 421908612172 is 271216809124.

It is not an unprimeable number, because it can be changed into a prime (421908612173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52738576518 + ... + 52738576525.

Almost surely, 2^421908612172 is an apocalyptic number.

It is an amenable number.

421908612172 is a deficient number, since it is larger than the sum of its proper divisors (316431459136).

421908612172 is a wasteful number, since it uses less digits than its factorization.

421908612172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105477153047 (or 105477153045 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 421908612172 in words is "four hundred twenty-one billion, nine hundred eight million, six hundred twelve thousand, one hundred seventy-two".