12444391121 has 2 divisors, whose sum is σ = 12444391122. Its totient is φ = 12444391120.

The previous prime is 12444391079. The next prime is 12444391123. The reversal of 12444391121 is 12119344421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8360542096 + 4083849025 = 91436^2 + 63905^2 .

It is a cyclic number.

It is not a de Polignac number, because 12444391121 - 2²² = 12440196817 is a prime.

Together with 12444391123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12444391123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6222195560 + 6222195561.

It is an arithmetic number, because the mean of its divisors is an integer number (6222195561).

Almost surely, 2^12444391121 is an apocalyptic number.

It is an amenable number.

12444391121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12444391121 is an equidigital number, since it uses as much as digits as its factorization.

12444391121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The spelling of 12444391121 in words is "twelve billion, four hundred forty-four million, three hundred ninety-one thousand, one hundred twenty-one".