21853459922 has 54 divisors (see below), whose sum is σ = 38768066127. Its totient is φ = 9212107968.

The previous prime is 21853459891. The next prime is 21853459939. The reversal of 21853459922 is 22995435812.

It can be written as a sum of positive squares in 5 ways, for example, as 16921066561 + 4932393361 = 130081^2 + 70231^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104531.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 159514238 + ... + 159514374.

Almost surely, 2^21853459922 is an apocalyptic number.

21853459922 is a deficient number, since it is larger than the sum of its proper divisors (16914606205).

21853459922 is an equidigital number, since it uses as much as digits as its factorization.

21853459922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508 (or 255 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 50.

Multiplying 21853459922 by its sum of digits (50), we get a square (1092672996100 = 1045310²).

The spelling of 21853459922 in words is "twenty-one billion, eight hundred fifty-three million, four hundred fifty-nine thousand, nine hundred twenty-two".