21974969528 has 16 divisors (see below), whose sum is σ = 41343697080. Its totient is φ = 10949983648.

The previous prime is 21974969519. The next prime is 21974969537. The reversal of 21974969528 is 82596947912.

It is an interprime number because it is at equal distance from previous prime (21974969519) and next prime (21974969537).

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, 4685150 + ... + 4689837.

Almost surely, 2^21974969528 is an apocalyptic number.

It is an amenable number.

21974969528 is a deficient number, since it is larger than the sum of its proper divisors (19368727552).

21974969528 is a wasteful number, since it uses less digits than its factorization.

21974969528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9375286 (or 9375282 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 62.

The spelling of 21974969528 in words is "twenty-one billion, nine hundred seventy-four million, nine hundred sixty-nine thousand, five hundred twenty-eight".