211312111 has 2 divisors, whose sum is σ = 211312112. Its totient is φ = 211312110.

The previous prime is 211312097. The next prime is 211312133. The reversal of 211312111 is 111213112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211312111 - 2⁷ = 211311983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211312091 and 211312100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211312181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105656055 + 105656056.

It is an arithmetic number, because the mean of its divisors is an integer number (105656056).

Almost surely, 2^211312111 is an apocalyptic number.

211312111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211312111 is an equidigital number, since it uses as much as digits as its factorization.

211312111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12, while the sum is 13.

The square root of 211312111 is about 14536.5783800728. The cubic root of 211312111 is about 595.6275759506.

Adding to 211312111 its reverse (111213112), we get a palindrome (322525223).

The spelling of 211312111 in words is "two hundred eleven million, three hundred twelve thousand, one hundred eleven".