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Since there are no units specified for 21, I will just solve for all.
- 21 Kilometers = 2100000 cm
- 21 Hectometers = 210000 cm
- 21 Decameters = 21000 cm
- 21 Meters = 2100 cm
- 21 Decimeters = 210 cm
- 21 Centimeters = 21 centimeters
- 21 Millimeters = 2.1 centimeters
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