201221212012111 has 2 divisors, whose sum is σ = 201221212012112. Its totient is φ = 201221212012110.

The previous prime is 201221212012087. The next prime is 201221212012123. The reversal of 201221212012111 is 111210212122102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221212012111 - 2³¹ = 201219064528463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221212013111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610606006055 + 100610606006056.

It is an arithmetic number, because the mean of its divisors is an integer number (100610606006056).

Almost surely, 2^{201221212012111} is an apocalyptic number.

201221212012111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221212012111 is an equidigital number, since it uses as much as digits as its factorization.

201221212012111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 201221212012111 its reverse (111210212122102), we get a palindrome (312431424134213).

The spelling of 201221212012111 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred twelve million, twelve thousand, one hundred eleven".