21192521528528 has 80 divisors (see below), whose sum is σ = 48546002976000. Its totient is φ = 8769037971456.

The previous prime is 21192521528447. The next prime is 21192521528533. The reversal of 21192521528528 is 82582512529112.

It is a self number, because there is not a number n which added to its sum of digits gives 21192521528528.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123724928 + ... + 123896096.

It is an arithmetic number, because the mean of its divisors is an integer number (606825037200).

Almost surely, 2^{21192521528528} is an apocalyptic number.

21192521528528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21192521528528 is an abundant number, since it is smaller than the sum of its proper divisors (27353481447472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21192521528528 is a wasteful number, since it uses less digits than its factorization.

21192521528528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209332 (or 209326 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 53.

The spelling of 21192521528528 in words is "twenty-one trillion, one hundred ninety-two billion, five hundred twenty-one million, five hundred twenty-eight thousand, five hundred twenty-eight".