You can easily convert 21 kilometers into miles using each unit definition:

- Kilometers
- kilo m = 1000 m
- Miles
- 5280 ft = 1609.344 m

With this information, you can calculate the quantity of miles 21 kilometers is equal to.

In 21 km there are 13.048795 mi.

Which is the same to say that **21 kilometers is 13.048795 miles**.

Twenty-one kilometers equals to thirteen miles. *Approximation

Performing the inverse calculation of the relationship between units, we obtain that **1 mile is 0.076635429 times 21 kilometers**.

A mile is zero times twenty-one kilometers. *Approximation

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