21243524530 has 32 divisors (see below), whose sum is σ = 40529165184. Its totient is φ = 7989363456.

The previous prime is 21243524527. The next prime is 21243524537. The reversal of 21243524530 is 3542534212.

It is a junction number, because it is equal to n+sod(n) for n = 21243524492 and 21243524501.

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 15 ways as a sum of consecutive naturals, for example, 103549 + ... + 230671.

It is an arithmetic number, because the mean of its divisors is an integer number (1266536412).

Almost surely, 2^21243524530 is an apocalyptic number.

21243524530 is a deficient number, since it is larger than the sum of its proper divisors (19285640654).

21243524530 is a wasteful number, since it uses less digits than its factorization.

21243524530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128130.

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 21243524530 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, five hundred thirty".