111,111,111,111,111,111,111

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


 * $3 \times 37 \times 43 \times 239 \times 1933 \times 4649 \times 10 \, 838 \, 689$


 * The $21$st repunit