201111122221111 has 2 divisors, whose sum is σ = 201111122221112. Its totient is φ = 201111122221110.

The previous prime is 201111122221099. The next prime is 201111122221117. The reversal of 201111122221111 is 111122221111102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201111122221111 - 2⁴⁵ = 165926750132279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201111122221117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555561110555 + 100555561110556.

It is an arithmetic number, because the mean of its divisors is an integer number (100555561110556).

Almost surely, 2^{201111122221111} is an apocalyptic number.

201111122221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111122221111 is an equidigital number, since it uses as much as digits as its factorization.

201111122221111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 201111122221111 its reverse (111122221111102), we get a palindrome (312233343332213).

The spelling of 201111122221111 in words is "two hundred one trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".