21175075016 has 64 divisors (see below), whose sum is σ = 43565921280. Its totient is φ = 9605283840.

The previous prime is 21175074941. The next prime is 21175075039. The reversal of 21175075016 is 61057057112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1073741 + ... + 1093283.

It is an arithmetic number, because the mean of its divisors is an integer number (680717520).

Almost surely, 2^21175075016 is an apocalyptic number.

It is an amenable number.

21175075016 is an abundant number, since it is smaller than the sum of its proper divisors (22390846264).

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

21175075016 is a wasteful number, since it uses less digits than its factorization.

21175075016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19854 (or 19850 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 35.

The spelling of 21175075016 in words is "twenty-one billion, one hundred seventy-five million, seventy-five thousand, sixteen".