21173204752 has 80 divisors (see below), whose sum is σ = 47171441152. Its totient is φ = 9018708480.

The previous prime is 21173204713. The next prime is 21173204771. The reversal of 21173204752 is 25740237112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15331102 + ... + 15332482.

Almost surely, 2^21173204752 is an apocalyptic number.

It is an amenable number.

21173204752 is an abundant number, since it is smaller than the sum of its proper divisors (25998236400).

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

21173204752 is a wasteful number, since it uses less digits than its factorization.

21173204752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2130 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The spelling of 21173204752 in words is "twenty-one billion, one hundred seventy-three million, two hundred four thousand, seven hundred fifty-two".