21259932804 has 216 divisors, whose sum is σ = 61291915776. Its totient is φ = 6202310400.

The previous prime is 21259932791. The next prime is 21259932821. The reversal of 21259932804 is 40823995212.

21259932804 is a `hidden beast` number, since 21 + 2 + 599 + 32 + 8 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21259932804.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 42266017 + ... + 42266519.

Almost surely, 2^21259932804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21259932804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30645957888).

21259932804 is an abundant number, since it is smaller than the sum of its proper divisors (40031982972).

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

21259932804 is a wasteful number, since it uses less digits than its factorization.

21259932804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 21259932804 in words is "twenty-one billion, two hundred fifty-nine million, nine hundred thirty-two thousand, eight hundred four".