12131811320 has 64 divisors (see below), whose sum is σ = 28969708320. Its totient is φ = 4556611584.

The previous prime is 12131811299. The next prime is 12131811323. The reversal of 12131811320 is 2311813121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131811323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273839 + ... + 315041.

Almost surely, 2^12131811320 is an apocalyptic number.

12131811320 is a gapful number since it is divisible by the number (10) 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 12131811320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14484854160).

12131811320 is an abundant number, since it is smaller than the sum of its proper divisors (16837897000).

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

12131811320 is a wasteful number, since it uses less digits than its factorization.

12131811320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41664 (or 41660 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 12131811320 in words is "twelve billion, one hundred thirty-one million, eight hundred eleven thousand, three hundred twenty".