21682680924 has 24 divisors (see below), whose sum is σ = 50595317248. Its totient is φ = 7227218160.

The previous prime is 21682680907. The next prime is 21682680949. The reversal of 21682680924 is 42908628612.

It is a happy number.

It is a congruent number.

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, 432819 + ... + 480309.

Almost surely, 2^21682680924 is an apocalyptic number.

It is an amenable number.

21682680924 is an abundant number, since it is smaller than the sum of its proper divisors (28912636324).

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

21682680924 is a wasteful number, since it uses less digits than its factorization.

21682680924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85545 (or 85543 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 21682680924 in words is "twenty-one billion, six hundred eighty-two million, six hundred eighty thousand, nine hundred twenty-four".