21750890368 has 16 divisors (see below), whose sum is σ = 43331852160. Its totient is φ = 10875445120.

The previous prime is 21750890327. The next prime is 21750890407. The reversal of 21750890368 is 86309805712.

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84964288 + ... + 84964543.

It is an arithmetic number, because the mean of its divisors is an integer number (2708240760).

Almost surely, 2^21750890368 is an apocalyptic number.

It is an amenable number.

21750890368 is a deficient number, since it is larger than the sum of its proper divisors (21580961792).

21750890368 is an equidigital number, since it uses as much as digits as its factorization.

21750890368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169928845 (or 169928833 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 21750890368 in words is "twenty-one billion, seven hundred fifty million, eight hundred ninety thousand, three hundred sixty-eight".