421620546172 has 12 divisors (see below), whose sum is σ = 843241092400. Its totient is φ = 180694519776.

The previous prime is 421620546161. The next prime is 421620546173. The reversal of 421620546172 is 271645026124.

It is a happy number.

421620546172 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421620546173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7528938297 + ... + 7528938352.

Almost surely, 2^421620546172 is an apocalyptic number.

It is an amenable number.

421620546172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421620546172 is a wasteful number, since it uses less digits than its factorization.

421620546172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15057876660 (or 15057876658 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 421620546172 in words is "four hundred twenty-one billion, six hundred twenty million, five hundred forty-six thousand, one hundred seventy-two".