201111212111 has 2 divisors, whose sum is σ = 201111212112. Its totient is φ = 201111212110.

The previous prime is 201111212101. The next prime is 201111212131. The reversal of 201111212111 is 111212111102.

201111212111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201111212111 - 2²² = 201107017807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201111212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555606055 + 100555606056.

It is an arithmetic number, because the mean of its divisors is an integer number (100555606056).

Almost surely, 2^201111212111 is an apocalyptic number.

201111212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111212111 is an equidigital number, since it uses as much as digits as its factorization.

201111212111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 201111212111 its reverse (111212111102), we get a palindrome (312323323213).

The spelling of 201111212111 in words is "two hundred one billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".