13231121312 has 48 divisors (see below), whose sum is σ = 27207109440. Its totient is φ = 6321925632.

The previous prime is 13231121303. The next prime is 13231121317. The reversal of 13231121312 is 21312113231.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (13231121317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822983 + ... + 838905.

It is an arithmetic number, because the mean of its divisors is an integer number (566814780).

Almost surely, 2^13231121312 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 13231121312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13603554720).

13231121312 is an abundant number, since it is smaller than the sum of its proper divisors (13975988128).

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

13231121312 is a wasteful number, since it uses less digits than its factorization.

13231121312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17085 (or 17077 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 13231121312 its reverse (21312113231), we get a palindrome (34543234543).

The spelling of 13231121312 in words is "thirteen billion, two hundred thirty-one million, one hundred twenty-one thousand, three hundred twelve".