12131111020 has 48 divisors (see below), whose sum is σ = 29324171520. Its totient is φ = 4129308864.

The previous prime is 12131110969. The next prime is 12131111021. The reversal of 12131111020 is 2011113121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12131111021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292234 + ... + 331153.

It is an arithmetic number, because the mean of its divisors is an integer number (610920240).

Almost surely, 2^12131111020 is an apocalyptic number.

12131111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131111020 is an abundant number, since it is smaller than the sum of its proper divisors (17193060500).

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

12131111020 is a wasteful number, since it uses less digits than its factorization.

12131111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623542 (or 623540 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 12131111020 its reverse (2011113121), we get a palindrome (14142224141).

The spelling of 12131111020 in words is "twelve billion, one hundred thirty-one million, one hundred eleven thousand, twenty".