111,111,111
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There are infinite calculations that result with the number in question. For example: 12345678987654320 +1 = 12345678987654321 12345678987654319 +2 = 12345678987654321 and so on.
12345678987654321. Pretty cool huh?
The number is a palindrome with increasing values and then linear decreasing values with a factor of 1, so the square root of 12345678987654321 is 111111111. Note that it has 9 digits, given that the largest value in 12345678987654321 is 9.
12345678987654321
24691357975308642