21117896736 has 48 divisors (see below), whose sum is σ = 55461246624. Its totient is φ = 7035899904.

The previous prime is 21117896687. The next prime is 21117896749. The reversal of 21117896736 is 63769871112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150795 + ... + 254901.

It is an arithmetic number, because the mean of its divisors is an integer number (1155442638).

Almost surely, 2^21117896736 is an apocalyptic number.

It is an amenable number.

21117896736 is an abundant number, since it is smaller than the sum of its proper divisors (34343349888).

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

21117896736 is a wasteful number, since it uses less digits than its factorization.

21117896736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106233 (or 106225 counting only the distinct ones).

The product of its digits is 762048, while the sum is 51.

The spelling of 21117896736 in words is "twenty-one billion, one hundred seventeen million, eight hundred ninety-six thousand, seven hundred thirty-six".