12421442191 has 2 divisors, whose sum is σ = 12421442192. Its totient is φ = 12421442190.

The previous prime is 12421442179. The next prime is 12421442213. The reversal of 12421442191 is 19124412421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12421442191 - 2⁹ = 12421441679 is a prime.

It is a super-2 number, since 2×12421442191² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12421442291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210721095 + 6210721096.

It is an arithmetic number, because the mean of its divisors is an integer number (6210721096).

Almost surely, 2^12421442191 is an apocalyptic number.

12421442191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421442191 is an equidigital number, since it uses as much as digits as its factorization.

12421442191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The spelling of 12421442191 in words is "twelve billion, four hundred twenty-one million, four hundred forty-two thousand, one hundred ninety-one".