21116644104 has 16 divisors (see below), whose sum is σ = 52791610320. Its totient is φ = 7038881360.

The previous prime is 21116644097. The next prime is 21116644169. The reversal of 21116644104 is 40144661112.

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, 439930062 + ... + 439930109.

It is an arithmetic number, because the mean of its divisors is an integer number (3299475645).

Almost surely, 2^21116644104 is an apocalyptic number.

21116644104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21116644104 is an abundant number, since it is smaller than the sum of its proper divisors (31674966216).

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

21116644104 is a wasteful number, since it uses less digits than its factorization.

21116644104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879860180 (or 879860176 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The spelling of 21116644104 in words is "twenty-one billion, one hundred sixteen million, six hundred forty-four thousand, one hundred four".