21097872696 has 16 divisors (see below), whose sum is σ = 52744681800. Its totient is φ = 7032624224.

The previous prime is 21097872683. The next prime is 21097872713. The reversal of 21097872696 is 69627879012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439538991 + ... + 439539038.

Almost surely, 2^21097872696 is an apocalyptic number.

It is an amenable number.

21097872696 is an abundant number, since it is smaller than the sum of its proper divisors (31646809104).

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

21097872696 is a wasteful number, since it uses less digits than its factorization.

21097872696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879078038 (or 879078034 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 57.

The spelling of 21097872696 in words is "twenty-one billion, ninety-seven million, eight hundred seventy-two thousand, six hundred ninety-six".