12420420191 has 2 divisors, whose sum is σ = 12420420192. Its totient is φ = 12420420190.

The previous prime is 12420420169. The next prime is 12420420281. The reversal of 12420420191 is 19102402421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12420420191 - 2⁶ = 12420420127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12420420191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12420420101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210210095 + 6210210096.

It is an arithmetic number, because the mean of its divisors is an integer number (6210210096).

Almost surely, 2^12420420191 is an apocalyptic number.

12420420191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420420191 is an equidigital number, since it uses as much as digits as its factorization.

12420420191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 12420420191 in words is "twelve billion, four hundred twenty million, four hundred twenty thousand, one hundred ninety-one".