21146897528 has 32 divisors (see below), whose sum is σ = 40545414000. Its totient is φ = 10336769280.

The previous prime is 21146897491. The next prime is 21146897537. The reversal of 21146897528 is 82579864112.

It is a self number, because there is not a number n which added to its sum of digits gives 21146897528.

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, 38333 + ... + 209196.

Almost surely, 2^21146897528 is an apocalyptic number.

It is an amenable number.

21146897528 is a deficient number, since it is larger than the sum of its proper divisors (19398516472).

21146897528 is a wasteful number, since it uses less digits than its factorization.

21146897528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247775 (or 247771 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 53.

The spelling of 21146897528 in words is "twenty-one billion, one hundred forty-six million, eight hundred ninety-seven thousand, five hundred twenty-eight".