201220111291 has 2 divisors, whose sum is σ = 201220111292. Its totient is φ = 201220111290.

The previous prime is 201220111273. The next prime is 201220111297. The reversal of 201220111291 is 192111022102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201220111291 - 2¹⁷ = 201219980219 is a prime.

It is not a weakly prime, because it can be changed into another prime (201220111297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610055645 + 100610055646.

It is an arithmetic number, because the mean of its divisors is an integer number (100610055646).

Almost surely, 2^201220111291 is an apocalyptic number.

201220111291 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220111291 is an equidigital number, since it uses as much as digits as its factorization.

201220111291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 201220111291 its reverse (192111022102), we get a palindrome (393331133393).

The spelling of 201220111291 in words is "two hundred one billion, two hundred twenty million, one hundred eleven thousand, two hundred ninety-one".