21572028732 has 24 divisors (see below), whose sum is σ = 50345075536. Its totient is φ = 7189198848.

The previous prime is 21572028721. The next prime is 21572028791. The reversal of 21572028732 is 23782027512.

It is a super-2 number, since 2×21572028732² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123013 + ... + 241404.

Almost surely, 2^21572028732 is an apocalyptic number.

It is an amenable number.

21572028732 is an abundant number, since it is smaller than the sum of its proper divisors (28773046804).

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

21572028732 is a wasteful number, since it uses less digits than its factorization.

21572028732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369357 (or 369355 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The spelling of 21572028732 in words is "twenty-one billion, five hundred seventy-two million, twenty-eight thousand, seven hundred thirty-two".