21304512552 has 64 divisors (see below), whose sum is σ = 53544081600. Its totient is φ = 7063879680.

The previous prime is 21304512539. The next prime is 21304512587. The reversal of 21304512552 is 25521540312.

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, 5296302 + ... + 5300322.

It is an arithmetic number, because the mean of its divisors is an integer number (836626275).

Almost surely, 2^21304512552 is an apocalyptic number.

It is an amenable number.

21304512552 is an abundant number, since it is smaller than the sum of its proper divisors (32239569048).

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

21304512552 is a wasteful number, since it uses less digits than its factorization.

21304512552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5146 (or 5142 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 21304512552 in words is "twenty-one billion, three hundred four million, five hundred twelve thousand, five hundred fifty-two".