211111010111 has 2 divisors, whose sum is σ = 211111010112. Its totient is φ = 211111010110.

The previous prime is 211111010059. The next prime is 211111010113. The reversal of 211111010111 is 111010111112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211111010111 is a prime.

Together with 211111010113, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211111010092 and 211111010101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211111010113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555505055 + 105555505056.

It is an arithmetic number, because the mean of its divisors is an integer number (105555505056).

Almost surely, 2^211111010111 is an apocalyptic number.

211111010111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211111010111 is an equidigital number, since it uses as much as digits as its factorization.

211111010111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 211111010111 its reverse (111010111112), we get a palindrome (322121121223).

The spelling of 211111010111 in words is "two hundred eleven billion, one hundred eleven million, ten thousand, one hundred eleven".