21304553116 has 24 divisors (see below), whose sum is σ = 46482662016. Its totient is φ = 8300475120.

The previous prime is 21304553093. The next prime is 21304553131. The reversal of 21304553116 is 61135540312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34585006 + ... + 34585621.

It is an arithmetic number, because the mean of its divisors is an integer number (1936777584).

Almost surely, 2^21304553116 is an apocalyptic number.

It is an amenable number.

21304553116 is an abundant number, since it is smaller than the sum of its proper divisors (25178108900).

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

21304553116 is a wasteful number, since it uses less digits than its factorization.

21304553116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69170649 (or 69170647 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 21304553116 in words is "twenty-one billion, three hundred four million, five hundred fifty-three thousand, one hundred sixteen".