10000...00001 (6867-digits)

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

This number is the largest known emirp of the trinomial form 10^x + c*10^y + k, discovered through an independent systematic search. It has 6,867 decimal digits and its decimal reverse is also prime, forming an emirp pair. This is part of the first comprehensive mapping of this specific class of reversible primes, with over 130 new emirps cataloged. [Ganda]