12131310420 has 72 divisors (see below), whose sum is σ = 37695850920. Its totient is φ = 3156111360.

The previous prime is 12131310391. The next prime is 12131310487. The reversal of 12131310420 is 2401313121.

12131310420 is a `hidden beast` number, since 1 + 213 + 1 + 31 + 0 + 420 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 401120784 + 11730189636 = 20028^2 + 108306^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12131310393 and 12131310402.

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, 814525 + ... + 829284.

It is an arithmetic number, because the mean of its divisors is an integer number (523553485).

Almost surely, 2^12131310420 is an apocalyptic number.

12131310420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131310420 is an abundant number, since it is smaller than the sum of its proper divisors (25564540500).

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

12131310420 is a wasteful number, since it uses less digits than its factorization.

12131310420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643865 (or 1643860 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12131310420 its reverse (2401313121), we get a palindrome (14532623541).

The spelling of 12131310420 in words is "twelve billion, one hundred thirty-one million, three hundred ten thousand, four hundred twenty".