21635875092 has 72 divisors (see below), whose sum is σ = 57379246176. Its totient is φ = 6306797376.

The previous prime is 21635875081. The next prime is 21635875109. The reversal of 21635875092 is 29057853612.

It is a super-2 number, since 2×21635875092² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135778 + ... + 248409.

Almost surely, 2^21635875092 is an apocalyptic number.

It is an amenable number.

21635875092 is an abundant number, since it is smaller than the sum of its proper divisors (35743371084).

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

21635875092 is a wasteful number, since it uses less digits than its factorization.

21635875092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384245 (or 384224 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 21635875092 in words is "twenty-one billion, six hundred thirty-five million, eight hundred seventy-five thousand, ninety-two".