21162239528 has 32 divisors (see below), whose sum is σ = 41321698560. Its totient is φ = 10149162240.

The previous prime is 21162239521. The next prime is 21162239569. The reversal of 21162239528 is 82593226112.

It is not an unprimeable number, because it can be changed into a prime (21162239521) by changing a digit.

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, 349550 + ... + 405597.

It is an arithmetic number, because the mean of its divisors is an integer number (1291303080).

Almost surely, 2^21162239528 is an apocalyptic number.

It is an amenable number.

21162239528 is a deficient number, since it is larger than the sum of its proper divisors (20159459032).

21162239528 is a wasteful number, since it uses less digits than its factorization.

21162239528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755297 (or 755293 counting only the distinct ones).

The product of its digits is 103680, while the sum is 41.

The spelling of 21162239528 in words is "twenty-one billion, one hundred sixty-two million, two hundred thirty-nine thousand, five hundred twenty-eight".