201111211111 has 2 divisors, whose sum is σ = 201111211112. Its totient is φ = 201111211110.

The previous prime is 201111211079. The next prime is 201111211117. The reversal of 201111211111 is 111112111102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201111211111 - 2⁵ = 201111211079 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201111211091 and 201111211100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201111211117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555605555 + 100555605556.

It is an arithmetic number, because the mean of its divisors is an integer number (100555605556).

Almost surely, 2^201111211111 is an apocalyptic number.

201111211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111211111 is an equidigital number, since it uses as much as digits as its factorization.

201111211111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 201111211111 its reverse (111112111102), we get a palindrome (312223322213).

The spelling of 201111211111 in words is "two hundred one billion, one hundred eleven million, two hundred eleven thousand, one hundred eleven".