211222111 has 2 divisors, whose sum is σ = 211222112. Its totient is φ = 211222110.

The previous prime is 211222097. The next prime is 211222147. The reversal of 211222111 is 111222112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211222111 - 2¹⁵ = 211189343 is a prime.

It is a super-2 number, since 2×211222111² = 89229560350592642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211222091 and 211222100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611055 + 105611056.

It is an arithmetic number, because the mean of its divisors is an integer number (105611056).

Almost surely, 2^211222111 is an apocalyptic number.

211222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222111 is an equidigital number, since it uses as much as digits as its factorization.

211222111 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 211222111 is about 14533.4824113149. The cubic root of 211222111 is about 595.5430026404.

Adding to 211222111 its reverse (111222112), we get a palindrome (322444223).

Subtracting from 211222111 its reverse (111222112), we obtain a palindrome (99999999).

The spelling of 211222111 in words is "two hundred eleven million, two hundred twenty-two thousand, one hundred eleven".