21023604522 has 24 divisors (see below), whose sum is σ = 46662148260. Its totient is φ = 6836944320.

The previous prime is 21023604509. The next prime is 21023604529. The reversal of 21023604522 is 22540632012.

It is a happy number.

21023604522 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 3 + 604 + 52 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20880539001 + 143065521 = 144501^2 + 11961^2 .

It is not an unprimeable number, because it can be changed into a prime (21023604529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14242897 + ... + 14244372.

Almost surely, 2^21023604522 is an apocalyptic number.

21023604522 is an abundant number, since it is smaller than the sum of its proper divisors (25638543738).

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

21023604522 is a wasteful number, since it uses less digits than its factorization.

21023604522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28487318 (or 28487315 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 21023604522 in words is "twenty-one billion, twenty-three million, six hundred four thousand, five hundred twenty-two".