21534469272 has 32 divisors (see below), whose sum is σ = 59817970800. Its totient is φ = 7178156352.

The previous prime is 21534469171. The next prime is 21534469277. The reversal of 21534469272 is 27296443512.

21534469272 is a `hidden beast` number, since 2 + 1 + 53 + 446 + 92 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534469277) 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, 49848093 + ... + 49848524.

Almost surely, 2^21534469272 is an apocalyptic number.

It is an amenable number.

21534469272 is an abundant number, since it is smaller than the sum of its proper divisors (38283501528).

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

21534469272 is a wasteful number, since it uses less digits than its factorization.

21534469272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99696632 (or 99696622 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 21534469272 in words is "twenty-one billion, five hundred thirty-four million, four hundred sixty-nine thousand, two hundred seventy-two".