21052522424 has 32 divisors (see below), whose sum is σ = 43995214800. Its totient is φ = 9385643520.

The previous prime is 21052522391. The next prime is 21052522489. The reversal of 21052522424 is 42422525012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4071047 + ... + 4076214.

Almost surely, 2^21052522424 is an apocalyptic number.

It is an amenable number.

21052522424 is an abundant number, since it is smaller than the sum of its proper divisors (22942692376).

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

21052522424 is a wasteful number, since it uses less digits than its factorization.

21052522424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8147303 (or 8147299 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

The spelling of 21052522424 in words is "twenty-one billion, fifty-two million, five hundred twenty-two thousand, four hundred twenty-four".