21432112312 has 64 divisors (see below), whose sum is σ = 43805008800. Its totient is φ = 9771632640.

The previous prime is 21432112307. The next prime is 21432112363. The reversal of 21432112312 is 21321123412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3002764 + ... + 3009892.

Almost surely, 2^21432112312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21432112312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21902504400).

21432112312 is an abundant number, since it is smaller than the sum of its proper divisors (22372896488).

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

21432112312 is a wasteful number, since it uses less digits than its factorization.

21432112312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7496 (or 7492 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

Adding to 21432112312 its reverse (21321123412), we get a palindrome (42753235724).

The spelling of 21432112312 in words is "twenty-one billion, four hundred thirty-two million, one hundred twelve thousand, three hundred twelve".