It you add up all the digit in the number they will total 11.
For example the number 425 has digits that sum to 11. (4 + 2 + 5 = 11)
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The difference betweenthe sum of the digits in odd positions andthe sum of the digits in even positionsis divisible by 11.
22
How about 65 because 6+5 = 11
65
11 squared is 121