12031131100 has 72 divisors (see below), whose sum is σ = 26379561600. Its totient is φ = 4762545600.

The previous prime is 12031131097. The next prime is 12031131181. The reversal of 12031131100 is 113113021.

It is a congruent number.

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, 4988895 + ... + 4991305.

It is an arithmetic number, because the mean of its divisors is an integer number (366382800).

Almost surely, 2^12031131100 is an apocalyptic number.

12031131100 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 12031131100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13189780800).

12031131100 is an abundant number, since it is smaller than the sum of its proper divisors (14348430500).

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

12031131100 is a wasteful number, since it uses less digits than its factorization.

12031131100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923 (or 2916 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 12031131100 its reverse (113113021), we get a palindrome (12144244121).

The spelling of 12031131100 in words is "twelve billion, thirty-one million, one hundred thirty-one thousand, one hundred".