21791093922 has 24 divisors (see below), whose sum is σ = 50845886364. Its totient is φ = 6704951904.

The previous prime is 21791093921. The next prime is 21791093923. The reversal of 21791093922 is 22939019712.

It is an interprime number because it is at equal distance from previous prime (21791093921) and next prime (21791093923).

It can be written as a sum of positive squares in 2 ways, for example, as 21321548361 + 469545561 = 146019^2 + 21669^2 .

It is not an unprimeable number, because it can be changed into a prime (21791093921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46561933 + ... + 46562400.

Almost surely, 2^21791093922 is an apocalyptic number.

21791093922 is an abundant number, since it is smaller than the sum of its proper divisors (29054792442).

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

21791093922 is a wasteful number, since it uses less digits than its factorization.

21791093922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93124354 (or 93124351 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 21791093922 in words is "twenty-one billion, seven hundred ninety-one million, ninety-three thousand, nine hundred twenty-two".