21750817168 has 20 divisors (see below), whose sum is σ = 43038852480. Its totient is φ = 10644016544.

The previous prime is 21750817141. The next prime is 21750817177. The reversal of 21750817168 is 86171805712.

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, 14461228 + ... + 14462731.

It is an arithmetic number, because the mean of its divisors is an integer number (2151942624).

Almost surely, 2^21750817168 is an apocalyptic number.

It is an amenable number.

21750817168 is a deficient number, since it is larger than the sum of its proper divisors (21288035312).

21750817168 is a wasteful number, since it uses less digits than its factorization.

21750817168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28924014 (or 28924008 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 46.

The spelling of 21750817168 in words is "twenty-one billion, seven hundred fifty million, eight hundred seventeen thousand, one hundred sixty-eight".