201221222222191 has 2 divisors, whose sum is σ = 201221222222192. Its totient is φ = 201221222222190.

The previous prime is 201221222222179. The next prime is 201221222222239. The reversal of 201221222222191 is 191222222122102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201221222222191 - 2¹¹ = 201221222220143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221222222161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610611111095 + 100610611111096.

It is an arithmetic number, because the mean of its divisors is an integer number (100610611111096).

Almost surely, 2^{201221222222191} is an apocalyptic number.

201221222222191 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221222222191 is an equidigital number, since it uses as much as digits as its factorization.

201221222222191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

Adding to 201221222222191 its reverse (191222222122102), we get a palindrome (392443444344293).

The spelling of 201221222222191 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred ninety-one".