12345...54321 (823-digits)

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

Just showing those entries submitted by 'Gupta': (Click here to show all)

The largest non-titanic palindromic prime of the form 1234567*10^(k + 7) + 7654321 (for k = 809), where k is the number of zeros between 1234567 and 7654321. [Gupta]