12131322312 has 96 divisors (see below), whose sum is σ = 32812365600. Its totient is φ = 3727213056.

The previous prime is 12131322299. The next prime is 12131322323. The reversal of 12131322312 is 21322313121.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 614548 + ... + 633980.

It is an arithmetic number, because the mean of its divisors is an integer number (341795475).

Almost surely, 2^12131322312 is an apocalyptic number.

12131322312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12131322312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16406182800).

12131322312 is an abundant number, since it is smaller than the sum of its proper divisors (20681043288).

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

12131322312 is a wasteful number, since it uses less digits than its factorization.

12131322312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19535 (or 19494 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 12131322312 its reverse (21322313121), we get a palindrome (33453635433).

The spelling of 12131322312 in words is "twelve billion, one hundred thirty-one million, three hundred twenty-two thousand, three hundred twelve".