11111...11111 (121-digits)

This number is a prime.

                    1 1111111111 1111111111 1111111111 1111111111 1111111111
1111222226 2222211111 1111111111 1111111111 1111111111 1111111111 1111111111

+ The smallest almost-minus-sign prime of order 11. (An almost minus sign prime is a palindromic prime of n^2 digits arranged left-right, top-down, in an n-by-n array, whose all the digits except for the middle row digits, are identical, equal to a, and the digits of the middle row (except for the central digit are identical too, equal to b. [Loungrides]

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