12340...04321 (1107-digits)

This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).

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The smallest titanic palindromic prime of the form 1234*10^(k + 4) + 4321 (for k = 1099), where k is the number of zeros between 1234 and 4321. [Gupta]