21587522328 has 64 divisors (see below), whose sum is σ = 61899724800. Its totient is φ = 6963714720.

The previous prime is 21587522323. The next prime is 21587522339. The reversal of 21587522328 is 82322578512.

21587522328 is a `hidden beast` number, since 2 + 15 + 87 + 522 + 32 + 8 = 666.

It is a super-2 number, since 2×21587522328² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21587522323) 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 15 ways as a sum of consecutive naturals, for example, 1605276 + ... + 1618667.

It is an arithmetic number, because the mean of its divisors is an integer number (967183200).

Almost surely, 2^21587522328 is an apocalyptic number.

It is an amenable number.

21587522328 is an abundant number, since it is smaller than the sum of its proper divisors (40312202472).

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

21587522328 is a wasteful number, since it uses less digits than its factorization.

21587522328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223989 (or 3223979 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The spelling of 21587522328 in words is "twenty-one billion, five hundred eighty-seven million, five hundred twenty-two thousand, three hundred twenty-eight".