11,111,111

Number
$11 \, 111 \, 111$ (eleven million, one hundred and eleven thousand, one hundred and eleven) is:


 * $11 \times 73 \times 101 \times 137$


 * The $8$th repuint after $1$, $11$, $111$, $1111$, $11 \, 111$, $111 \, 111$, $1 \, 111 \, 111$


 * The $12$th palindromic integer after $0$, $1$, $2$, $3$, $11$, $77$, $363$, $1111$, $2662$, $111 \, 111$, $246 \, 642$ which is the index of a palindromic triangular number
 * $T_{11 \, 111 \, 111} = 61 \, 728 \, 399 \, 382 \, 716$


 * A palindromic number whose square is also palindromic:
 * $11 \, 111 \, 111^2 = 123 \, 456 \, 787 \, 654 \, 321$

Also see

 * Square of Small-Digit Palindromic Number is Palindromic