It s 23611 digits and is what I call a tetradic “superpalindrome!” It keeps on repeating digits, but only ones and zeros. It has many lines of symmetry.

The only other tetradic "superpalindrome" with only ones and zeros that I ve discovered so far is:
(((10^11-1)/9)*10^20+111*10^14)*(10^(13*20)-1)/((10^20-1)/1)+((10^11-1)/9) with 271 digits

To be completed...