Solutions by everydaycalculation.com
The simplest form of 21212121 is 11.
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Equivalent fractions: 4242/4242 6363/6363 707/707 303/303
More fractions: 4242/2121 2121/4242 6363/2121 2121/6363 2122/2121 2121/21222120/2121 2121/2120
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