201221101012111 has 2 divisors, whose sum is σ = 201221101012112. Its totient is φ = 201221101012110.

The previous prime is 201221101012073. The next prime is 201221101012117. The reversal of 201221101012111 is 111210101122102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221101012111 - 2⁹ = 201221101011599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221101012117) 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, 100610550506055 + 100610550506056.

It is an arithmetic number, because the mean of its divisors is an integer number (100610550506056).

Almost surely, 2^{201221101012111} is an apocalyptic number.

201221101012111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221101012111 is an equidigital number, since it uses as much as digits as its factorization.

201221101012111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 201221101012111 its reverse (111210101122102), we get a palindrome (312431202134213).

The spelling of 201221101012111 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred one million, twelve thousand, one hundred eleven".