21373472404664 has 64 divisors (see below), whose sum is σ = 41606293680000. Its totient is φ = 10281138416640.

The previous prime is 21373472404663. The next prime is 21373472404703. The reversal of 21373472404664 is 46640427437312.

21373472404664 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373472404663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185040449 + ... + 185155919.

It is an arithmetic number, because the mean of its divisors is an integer number (650098338750).

Almost surely, 2^{21373472404664} is an apocalyptic number.

It is an amenable number.

21373472404664 is a deficient number, since it is larger than the sum of its proper divisors (20232821275336).

21373472404664 is a wasteful number, since it uses less digits than its factorization.

21373472404664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118368 (or 118364 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 53.

The spelling of 21373472404664 in words is "twenty-one trillion, three hundred seventy-three billion, four hundred seventy-two million, four hundred four thousand, six hundred sixty-four".