21007064108 has 12 divisors (see below), whose sum is σ = 37042991832. Its totient is φ = 10423352160.

The previous prime is 21007064059. The next prime is 21007064159. The reversal of 21007064108 is 80146070012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20044385 + ... + 20045432.

It is an arithmetic number, because the mean of its divisors is an integer number (3086915986).

Almost surely, 2^21007064108 is an apocalyptic number.

It is an amenable number.

21007064108 is a deficient number, since it is larger than the sum of its proper divisors (16035927724).

21007064108 is a wasteful number, since it uses less digits than its factorization.

21007064108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40089952 (or 40089950 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The spelling of 21007064108 in words is "twenty-one billion, seven million, sixty-four thousand, one hundred eight".