1212212112191 has 2 divisors, whose sum is σ = 1212212112192. Its totient is φ = 1212212112190.

The previous prime is 1212212112173. The next prime is 1212212112193. The reversal of 1212212112191 is 1912112122121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212212112191 is a prime.

Together with 1212212112193, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212212112191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212212112193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606106056095 + 606106056096.

It is an arithmetic number, because the mean of its divisors is an integer number (606106056096).

Almost surely, 2^{1212212112191} is an apocalyptic number.

1212212112191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212212112191 is an equidigital number, since it uses as much as digits as its factorization.

1212212112191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 26.

The spelling of 1212212112191 in words is "one trillion, two hundred twelve billion, two hundred twelve million, one hundred twelve thousand, one hundred ninety-one".