You can easily convert 21 centimeters into millimeters using each unit definition:

- Centimeters
- centi m = 0.01 m
- Millimeters
- milli m = 0.001 m

With this information, you can calculate the quantity of millimeters 21 centimeters is equal to.

In 21 cm there are 210 mm.

Which is the same to say that **21 centimeters is 210 millimeters**.

Twenty-one centimeters equals to two hundred ten millimeters. *Approximation

Performing the inverse calculation of the relationship between units, we obtain that **1 millimeter is 0.0047619048 times 21 centimeters**.

A millimeter is zero times twenty-one centimeters. *Approximation

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