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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.

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13y ago
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Q: Which number multiplied by itself gives the answer 12 345 678 987 654 321?
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