21243524472 has 24 divisors (see below), whose sum is σ = 57534545640. Its totient is φ = 7081174800.

The previous prime is 21243524459. The next prime is 21243524509. The reversal of 21243524472 is 27442534212.

21243524472 is a `hidden beast` number, since 2 + 124 + 3 + 524 + 4 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 147524404 + ... + 147524547.

It is an arithmetic number, because the mean of its divisors is an integer number (2397272735).

Almost surely, 2^21243524472 is an apocalyptic number.

It is an amenable number.

21243524472 is an abundant number, since it is smaller than the sum of its proper divisors (36291021168).

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

21243524472 is a wasteful number, since it uses less digits than its factorization.

21243524472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295048963 (or 295048956 counting only the distinct ones).

The product of its digits is 107520, while the sum is 36.

The spelling of 21243524472 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, four hundred seventy-two".