21333232432 has 40 divisors (see below), whose sum is σ = 41539194000. Its totient is φ = 10613574912.

The previous prime is 21333232399. The next prime is 21333232447. The reversal of 21333232432 is 23423233312.

It is a self number, because there is not a number n which added to its sum of digits gives 21333232432.

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 7 ways as a sum of consecutive naturals, for example, 2822194 + ... + 2829742.

It is an arithmetic number, because the mean of its divisors is an integer number (1038479850).

Almost surely, 2^21333232432 is an apocalyptic number.

It is an amenable number.

21333232432 is a deficient number, since it is larger than the sum of its proper divisors (20205961568).

21333232432 is a wasteful number, since it uses less digits than its factorization.

21333232432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8413 (or 8407 counting only the distinct ones).

The product of its digits is 15552, while the sum is 28.

Adding to 21333232432 its reverse (23423233312), we get a palindrome (44756465744).

The spelling of 21333232432 in words is "twenty-one billion, three hundred thirty-three million, two hundred thirty-two thousand, four hundred thirty-two".