21989702608 has 40 divisors (see below), whose sum is σ = 43825382496. Its totient is φ = 10684272000.

The previous prime is 21989702551. The next prime is 21989702617. The reversal of 21989702608 is 80620798912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54718 + ... + 216733.

Almost surely, 2^21989702608 is an apocalyptic number.

It is an amenable number.

21989702608 is a deficient number, since it is larger than the sum of its proper divisors (21835679888).

21989702608 is a wasteful number, since it uses less digits than its factorization.

21989702608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271603 (or 271597 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 21989702608 in words is "twenty-one billion, nine hundred eighty-nine million, seven hundred two thousand, six hundred eight".