Number Trivia

Can you find out which number multiplied by itself will give the output as 12345678987654321?




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For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
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When it is alive we sing, when it is dead we clap our hands. What is it?

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I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
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