1,111,111,111/Mistake/Second Edition

Source Work

 * The Dictionary
 * $297$
 * $297$

Mistake

 * So is $1,1111,111,111$ [a Kaprekar number ], the smallest Kaprekar number of $10$ digits whose square is $12, 345, 671, 900, 987, 654, 321$.

The square is incorrect. It should be:
 * $1,234,567,900,987,654,321$