12131100912 has 120 divisors (see below), whose sum is σ = 36831715536. Its totient is φ = 3430232064.

The previous prime is 12131100911. The next prime is 12131100953. The reversal of 12131100912 is 21900113121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131100911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201558 + ... + 254730.

Almost surely, 2^12131100912 is an apocalyptic number.

12131100912 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 12131100912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18415857768).

12131100912 is an abundant number, since it is smaller than the sum of its proper divisors (24700614624).

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

12131100912 is a wasteful number, since it uses less digits than its factorization.

12131100912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53295 (or 53282 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 21.

The spelling of 12131100912 in words is "twelve billion, one hundred thirty-one million, one hundred thousand, nine hundred twelve".