11212211112191 has 2 divisors, whose sum is σ = 11212211112192. Its totient is φ = 11212211112190.

The previous prime is 11212211112149. The next prime is 11212211112247. The reversal of 11212211112191 is 19121111221211.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11212211112191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11212211112191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212211112101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606105556095 + 5606105556096.

It is an arithmetic number, because the mean of its divisors is an integer number (5606105556096).

Almost surely, 2^{11212211112191} is an apocalyptic number.

11212211112191 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212211112191 is an equidigital number, since it uses as much as digits as its factorization.

11212211112191 is an evil number, because the sum of its binary digits is even.

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

The spelling of 11212211112191 in words is "eleven trillion, two hundred twelve billion, two hundred eleven million, one hundred twelve thousand, one hundred ninety-one".