11,111,111,111,111,111,111

Number
$11 \, 111 \, 111 \, 111 \, 111 \, 111 \, 111$ is:


 * $11 \times 41 \times 101 \times 271 \times 3541 \times 9091 \times 27961$


 * The $20$th repunit