21215625432 has 32 divisors (see below), whose sum is σ = 53054596080. Its totient is φ = 7069804160.

The previous prime is 21215625427. The next prime is 21215625433. The reversal of 21215625432 is 23452651212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21215625393 and 21215625402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21215625433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44643 + ... + 210770.

Almost surely, 2^21215625432 is an apocalyptic number.

It is an amenable number.

21215625432 is an abundant number, since it is smaller than the sum of its proper divisors (31838970648).

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

21215625432 is a wasteful number, since it uses less digits than its factorization.

21215625432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258883 (or 258879 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The spelling of 21215625432 in words is "twenty-one billion, two hundred fifteen million, six hundred twenty-five thousand, four hundred thirty-two".