99999...99999 (221-digits)

This number is a prime.

                                                                9 9999999999
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9899999999
9999999988 8999999999 9999999881 8899999999 9999999988 8999999999 9999999899
9999999999 9999999999 9999999999 9999999999 9999999999 9999999999 9999999999

+ The largest diamond-congruent prime of order 11. [Patterson]

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