21311324132 has 12 divisors (see below), whose sum is σ = 42622648320. Its totient is φ = 9133424616.

The previous prime is 21311324093. The next prime is 21311324149. The reversal of 21311324132 is 23142311312.

21311324132 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21311324098 and 21311324107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380559332 + ... + 380559387.

It is an arithmetic number, because the mean of its divisors is an integer number (3551887360).

Almost surely, 2^21311324132 is an apocalyptic number.

It is an amenable number.

21311324132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21311324132 is a wasteful number, since it uses less digits than its factorization.

21311324132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761118730 (or 761118728 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

Adding to 21311324132 its reverse (23142311312), we get a palindrome (44453635444).

The spelling of 21311324132 in words is "twenty-one billion, three hundred eleven million, three hundred twenty-four thousand, one hundred thirty-two".