21504322524 has 24 divisors (see below), whose sum is σ = 50198756608. Its totient is φ = 7164964080.

The previous prime is 21504322487. The next prime is 21504322529. The reversal of 21504322524 is 42522340512.

It is a junction number, because it is equal to n+sod(n) for n = 21504322491 and 21504322500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504322529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364342 + ... + 419229.

Almost surely, 2^21504322524 is an apocalyptic number.

It is an amenable number.

21504322524 is an abundant number, since it is smaller than the sum of its proper divisors (28694434084).

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

21504322524 is a wasteful number, since it uses less digits than its factorization.

21504322524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785865 (or 785863 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The spelling of 21504322524 in words is "twenty-one billion, five hundred four million, three hundred twenty-two thousand, five hundred twenty-four".