21525504532 has 24 divisors (see below), whose sum is σ = 43062848640. Its totient is φ = 9222679200.

The previous prime is 21525504521. The next prime is 21525504557. The reversal of 21525504532 is 23540552512.

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, 232 + ... + 207487.

It is an arithmetic number, because the mean of its divisors is an integer number (1794285360).

Almost surely, 2^21525504532 is an apocalyptic number.

It is an amenable number.

21525504532 is an abundant number, since it is smaller than the sum of its proper divisors (21537344108).

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

21525504532 is a wasteful number, since it uses less digits than its factorization.

21525504532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211431 (or 211429 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 21525504532 in words is "twenty-one billion, five hundred twenty-five million, five hundred four thousand, five hundred thirty-two".