109876543210

This number is a composite.

                                                               10 9876543210

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+ The concatenation in reverse order of first eleven numbers (10 to 0) minus the concatenation of eleven 1's, or eleven 3's, or eleven 9's, are all primes, i.e., 98765432099, 76543209877, 9876543211. [Loungrides]

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