21523313524 has 24 divisors (see below), whose sum is σ = 37772884800. Its totient is φ = 10731105216.

The previous prime is 21523313521. The next prime is 21523313557. The reversal of 21523313524 is 42531332512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523313521) 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, 2240259 + ... + 2249845.

It is an arithmetic number, because the mean of its divisors is an integer number (1573870200).

Almost surely, 2^21523313524 is an apocalyptic number.

It is an amenable number.

21523313524 is a deficient number, since it is larger than the sum of its proper divisors (16249571276).

21523313524 is a wasteful number, since it uses less digits than its factorization.

21523313524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11127 (or 11125 counting only the distinct ones).

The product of its digits is 21600, while the sum is 31.

The spelling of 21523313524 in words is "twenty-one billion, five hundred twenty-three million, three hundred thirteen thousand, five hundred twenty-four".