12420135273991 has 2 divisors, whose sum is σ = 12420135273992. Its totient is φ = 12420135273990.

The previous prime is 12420135273919. The next prime is 12420135274031. The reversal of 12420135273991 is 19937253102421.

Together with previous prime (12420135273919) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12420135273991 - 2⁷ = 12420135273863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12420135271991) 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 as a sum of consecutive naturals, namely, 6210067636995 + 6210067636996.

It is an arithmetic number, because the mean of its divisors is an integer number (6210067636996).

Almost surely, 2^{12420135273991} is an apocalyptic number.

12420135273991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420135273991 is an equidigital number, since it uses as much as digits as its factorization.

12420135273991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 12420135273991 in words is "twelve trillion, four hundred twenty billion, one hundred thirty-five million, two hundred seventy-three thousand, nine hundred ninety-one".