21243524532 has 24 divisors (see below), whose sum is σ = 49845146400. Its totient is φ = 7041614496.

The previous prime is 21243524527. The next prime is 21243524537. The reversal of 21243524532 is 23542534212.

It is an interprime number because it is at equal distance from previous prime (21243524527) and next prime (21243524537).

It is a junction number, because it is equal to n+sod(n) for n = 21243524493 and 21243524502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243524537) 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 7 ways as a sum of consecutive naturals, for example, 4942807 + ... + 4947102.

It is an arithmetic number, because the mean of its divisors is an integer number (2076881100).

Almost surely, 2^21243524532 is an apocalyptic number.

It is an amenable number.

21243524532 is an abundant number, since it is smaller than the sum of its proper divisors (28601621868).

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

21243524532 is a wasteful number, since it uses less digits than its factorization.

21243524532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9890095 (or 9890093 counting only the distinct ones).

The product of its digits is 57600, while the sum is 33.

The spelling of 21243524532 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, five hundred thirty-two".