21672507324 has 48 divisors (see below), whose sum is σ = 57662605728. Its totient is φ = 6276200448.

The previous prime is 21672507313. The next prime is 21672507359. The reversal of 21672507324 is 42370527612.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4083417 + ... + 4088720.

It is an arithmetic number, because the mean of its divisors is an integer number (1201304286).

Almost surely, 2^21672507324 is an apocalyptic number.

It is an amenable number.

21672507324 is an abundant number, since it is smaller than the sum of its proper divisors (35990098404).

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

21672507324 is a wasteful number, since it uses less digits than its factorization.

21672507324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172174 (or 8172172 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 39.

The spelling of 21672507324 in words is "twenty-one billion, six hundred seventy-two million, five hundred seven thousand, three hundred twenty-four".