121201212111191 has 2 divisors, whose sum is σ = 121201212111192. Its totient is φ = 121201212111190.

The previous prime is 121201212111167. The next prime is 121201212111223. The reversal of 121201212111191 is 191111212102121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201212111191 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121201212111191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121201212111691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600606055595 + 60600606055596.

It is an arithmetic number, because the mean of its divisors is an integer number (60600606055596).

Almost surely, 2^{121201212111191} is an apocalyptic number.

121201212111191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201212111191 is an equidigital number, since it uses as much as digits as its factorization.

121201212111191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 26.

The spelling of 121201212111191 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred twelve million, one hundred eleven thousand, one hundred ninety-one".