21618734796 has 36 divisors (see below), whose sum is σ = 55395958072. Its totient is φ = 7107528384.

The previous prime is 21618734737. The next prime is 21618734843. The reversal of 21618734796 is 69743781612.

21618734796 is a `hidden beast` number, since 2 + 161 + 8 + 7 + 3 + 479 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4110526 + ... + 4115781.

Almost surely, 2^21618734796 is an apocalyptic number.

It is an amenable number.

21618734796 is an abundant number, since it is smaller than the sum of its proper divisors (33777223276).

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

21618734796 is a wasteful number, since it uses less digits than its factorization.

21618734796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8226390 (or 8226385 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 21618734796 in words is "twenty-one billion, six hundred eighteen million, seven hundred thirty-four thousand, seven hundred ninety-six".