21351524232 has 64 divisors (see below), whose sum is σ = 53956526400. Its totient is φ = 7040517120.

The previous prime is 21351524231. The next prime is 21351524237. The reversal of 21351524232 is 23242515312.

It is a self number, because there is not a number n which added to its sum of digits gives 21351524232.

It is not an unprimeable number, because it can be changed into a prime (21351524231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 926028 + ... + 948804.

It is an arithmetic number, because the mean of its divisors is an integer number (843070725).

Almost surely, 2^21351524232 is an apocalyptic number.

It is an amenable number.

21351524232 is an abundant number, since it is smaller than the sum of its proper divisors (32605002168).

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

21351524232 is a wasteful number, since it uses less digits than its factorization.

21351524232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23206 (or 23202 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The spelling of 21351524232 in words is "twenty-one billion, three hundred fifty-one million, five hundred twenty-four thousand, two hundred thirty-two".