21525492 has 48 divisors (see below), whose sum is σ = 52299072. Its totient is φ = 6885120.

The previous prime is 21525481. The next prime is 21525529. The reversal of 21525492 is 29452512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32638 + ... + 33290.

It is an arithmetic number, because the mean of its divisors is an integer number (1089564).

Almost surely, 2^21525492 is an apocalyptic number.

It is an amenable number.

21525492 is an abundant number, since it is smaller than the sum of its proper divisors (30773580).

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

21525492 is a wasteful number, since it uses less digits than its factorization.

21525492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 766 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 21525492 is about 4639.5573064679. The cubic root of 21525492 is about 278.1747430618.

The spelling of 21525492 in words is "twenty-one million, five hundred twenty-five thousand, four hundred ninety-two".