2122220011991 has 2 divisors, whose sum is σ = 2122220011992. Its totient is φ = 2122220011990.

The previous prime is 2122220011871. The next prime is 2122220012041. The reversal of 2122220011991 is 1991100222212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2122220011991 - 2²⁶ = 2122152903127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122220017991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061110005995 + 1061110005996.

It is an arithmetic number, because the mean of its divisors is an integer number (1061110005996).

Almost surely, 2^{2122220011991} is an apocalyptic number.

2122220011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122220011991 is an equidigital number, since it uses as much as digits as its factorization.

2122220011991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 2122220011991 in words is "two trillion, one hundred twenty-two billion, two hundred twenty million, eleven thousand, nine hundred ninety-one".