12131444021 has 2 divisors, whose sum is σ = 12131444022. Its totient is φ = 12131444020.

The previous prime is 12131444011. The next prime is 12131444027. The reversal of 12131444021 is 12044413121.

12131444021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8889849796 + 3241594225 = 94286^2 + 56935^2 .

It is a cyclic number.

It is not a de Polignac number, because 12131444021 - 2¹⁸ = 12131181877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12131444027) 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 as a sum of consecutive naturals, namely, 6065722010 + 6065722011.

It is an arithmetic number, because the mean of its divisors is an integer number (6065722011).

Almost surely, 2^12131444021 is an apocalyptic number.

It is an amenable number.

12131444021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12131444021 is an equidigital number, since it uses as much as digits as its factorization.

12131444021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 12131444021 its reverse (12044413121), we get a palindrome (24175857142).

The spelling of 12131444021 in words is "twelve billion, one hundred thirty-one million, four hundred forty-four thousand, twenty-one".