211122211 has 2 divisors, whose sum is σ = 211122212. Its totient is φ = 211122210.

The previous prime is 211122157. The next prime is 211122251. The reversal of 211122211 is 112221112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211122211 - 2¹⁹ = 210597923 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211122191 and 211122200.

It is not a weakly prime, because it can be changed into another prime (211122251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561105 + 105561106.

It is an arithmetic number, because the mean of its divisors is an integer number (105561106).

Almost surely, 2^211122211 is an apocalyptic number.

211122211 is a deficient number, since it is larger than the sum of its proper divisors (1).

211122211 is an equidigital number, since it uses as much as digits as its factorization.

211122211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16, while the sum is 13.

The square root of 211122211 is about 14530.0451134881. The cubic root of 211122211 is about 595.4490981280.

Adding to 211122211 its reverse (112221112), we get a palindrome (323343323).

The spelling of 211122211 in words is "two hundred eleven million, one hundred twenty-two thousand, two hundred eleven".