21243524492 has 24 divisors (see below), whose sum is σ = 37244637360. Its totient is φ = 10602221760.

The previous prime is 21243524459. The next prime is 21243524509. The reversal of 21243524492 is 29442534212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8609843 + ... + 8612309.

It is an arithmetic number, because the mean of its divisors is an integer number (1551859890).

Almost surely, 2^21243524492 is an apocalyptic number.

It is an amenable number.

21243524492 is a deficient number, since it is larger than the sum of its proper divisors (16001112868).

21243524492 is a wasteful number, since it uses less digits than its factorization.

21243524492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5561 (or 5559 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The spelling of 21243524492 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, four hundred ninety-two".