2122210221991 has 2 divisors, whose sum is σ = 2122210221992. Its totient is φ = 2122210221990.

The previous prime is 2122210221959. The next prime is 2122210222057. The reversal of 2122210221991 is 1991220122212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2122210221991 - 2⁵ = 2122210221959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122210221931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061105110995 + 1061105110996.

It is an arithmetic number, because the mean of its divisors is an integer number (1061105110996).

Almost surely, 2^{2122210221991} is an apocalyptic number.

2122210221991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122210221991 is an equidigital number, since it uses as much as digits as its factorization.

2122210221991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The spelling of 2122210221991 in words is "two trillion, one hundred twenty-two billion, two hundred ten million, two hundred twenty-one thousand, nine hundred ninety-one".