22,222,222,222,222

Number
$22 \, 222 \, 222 \, 222 \, 222$ is:


 * $2 \times 11 \times 239 \times 4649 \times 909 \, 091$


 * A Kaprekar number:
 * $22 \, 222 \, 222 \, 222 \, 222^2= 493 \, 827 \, 160 \, 493 \, 817 \, 283 \, 950 \, 617 \, 284 \to 4 \, 938 \, 271 \, 604 \, 938 + 17 \, 283 \, 950 \, 617 \, 284 = 22 \, 222 \, 222 \, 222 \, 222$