12131430520 has 64 divisors (see below), whose sum is σ = 31528764000. Its totient is φ = 4151930880.

The previous prime is 12131430511. The next prime is 12131430527. The reversal of 12131430520 is 2503413121.

It is a happy number.

12131430520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 12131430491 and 12131430500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131430527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 803445 + ... + 818404.

Almost surely, 2^12131430520 is an apocalyptic number.

12131430520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131430520 is an abundant number, since it is smaller than the sum of its proper divisors (19397333480).

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

12131430520 is a wasteful number, since it uses less digits than its factorization.

12131430520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621888 (or 1621884 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 12131430520 its reverse (2503413121), we get a palindrome (14634843641).

The spelling of 12131430520 in words is "twelve billion, one hundred thirty-one million, four hundred thirty thousand, five hundred twenty".