The square root of 12,345,678,987,654,321 is 111,111,111.
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It is: 111,111,1112 = 12,345,678,987,456,321
If that's one number then its square root is 111,111,111
The number is 111,111,111.
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.
99,990 multiplied by 321 is 32,096,790