12131220313 has 4 divisors (see below), whose sum is σ = 12131441280. Its totient is φ = 12130999348.

The previous prime is 12131220253. The next prime is 12131220331. The reversal of 12131220313 is 31302213121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31302213121 = 179 ⋅174872699.

It is a cyclic number.

It is not a de Polignac number, because 12131220313 - 2¹⁷ = 12131089241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131220613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42228 + ... + 161386.

It is an arithmetic number, because the mean of its divisors is an integer number (3032860320).

Almost surely, 2^12131220313 is an apocalyptic number.

It is an amenable number.

12131220313 is a deficient number, since it is larger than the sum of its proper divisors (220967).

12131220313 is a wasteful number, since it uses less digits than its factorization.

12131220313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220966.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12131220313 its reverse (31302213121), we get a palindrome (43433433434).

The spelling of 12131220313 in words is "twelve billion, one hundred thirty-one million, two hundred twenty thousand, three hundred thirteen".