what number, when multiplied by itself gives the result of 12,345,678,987,654,321?

1*1 = 1
11*11 = 121
111*111 = 12,321
1,111*1,111 = 1,234,321
11,111*11,111 = 1,234,543,221
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111,111,111*111,111,111 = 12,345,678,987,654,321

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