21525412544 has 56 divisors (see below), whose sum is σ = 43061382000. Its totient is φ = 10675512320.

The previous prime is 21525412481. The next prime is 21525412561. The reversal of 21525412544 is 44521452512.

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 7 ways as a sum of consecutive naturals, for example, 10402742 + ... + 10404810.

It is an arithmetic number, because the mean of its divisors is an integer number (768953250).

Almost surely, 2^21525412544 is an apocalyptic number.

It is an amenable number.

21525412544 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21525412544 is a wasteful number, since it uses less digits than its factorization.

21525412544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321 (or 3311 counting only the distinct ones).

The product of its digits is 64000, while the sum is 35.

The spelling of 21525412544 in words is "twenty-one billion, five hundred twenty-five million, four hundred twelve thousand, five hundred forty-four".