21175378116 has 24 divisors (see below), whose sum is σ = 49862514240. Its totient is φ = 6993702432.

The previous prime is 21175378097. The next prime is 21175378123. The reversal of 21175378116 is 61187357112.

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, 8093256 + ... + 8095871.

It is an arithmetic number, because the mean of its divisors is an integer number (2077604760).

Almost surely, 2^21175378116 is an apocalyptic number.

It is an amenable number.

21175378116 is an abundant number, since it is smaller than the sum of its proper divisors (28687136124).

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

21175378116 is a wasteful number, since it uses less digits than its factorization.

21175378116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16189243 (or 16189241 counting only the distinct ones).

The product of its digits is 70560, while the sum is 42.

The spelling of 21175378116 in words is "twenty-one billion, one hundred seventy-five million, three hundred seventy-eight thousand, one hundred sixteen".