21243524533 has 24 divisors (see below), whose sum is σ = 27220190400. Its totient is φ = 16392640320.

The previous prime is 21243524527. The next prime is 21243524537. The reversal of 21243524533 is 33542534212.

It is not a de Polignac number, because 21243524533 - 2²⁹ = 20706653621 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135808 + ... + 246841.

It is an arithmetic number, because the mean of its divisors is an integer number (1134174600).

Almost surely, 2^21243524533 is an apocalyptic number.

It is an amenable number.

21243524533 is a deficient number, since it is larger than the sum of its proper divisors (5976665867).

21243524533 is a wasteful number, since it uses less digits than its factorization.

21243524533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382777 (or 382770 counting only the distinct ones).

The product of its digits is 86400, while the sum is 34.

The spelling of 21243524533 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, five hundred thirty-three".