21751973528 has 16 divisors (see below), whose sum is σ = 42931527000. Its totient is φ = 10303566336.

The previous prime is 21751973497. The next prime is 21751973531. The reversal of 21751973528 is 82537915712.

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, 71552393 + ... + 71552696.

Almost surely, 2^21751973528 is an apocalyptic number.

It is an amenable number.

21751973528 is a deficient number, since it is larger than the sum of its proper divisors (21179553472).

21751973528 is a wasteful number, since it uses less digits than its factorization.

21751973528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143105114 (or 143105110 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 50.

The spelling of 21751973528 in words is "twenty-one billion, seven hundred fifty-one million, nine hundred seventy-three thousand, five hundred twenty-eight".