2212222111991 has 2 divisors, whose sum is σ = 2212222111992. Its totient is φ = 2212222111990.

The previous prime is 2212222111961. The next prime is 2212222112029. The reversal of 2212222111991 is 1991112222122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2212222111991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2212222111901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1106111055995 + 1106111055996.

It is an arithmetic number, because the mean of its divisors is an integer number (1106111055996).

Almost surely, 2^{2212222111991} is an apocalyptic number.

2212222111991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2212222111991 is an equidigital number, since it uses as much as digits as its factorization.

2212222111991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 35.

The spelling of 2212222111991 in words is "two trillion, two hundred twelve billion, two hundred twenty-two million, one hundred eleven thousand, nine hundred ninety-one".