| 21 millimeters in kilometers | 2.1E-5 kms |
| 21 millimeters in meters | 0.021 ms |
| 21 millimeters in decimeters | 0.21 dms |
| 21 millimeters in centimeters | 2.1 cms |
| 21 millimeters in miles | 0 mis |
| 21 millimeters in yards | 0.02296581 yds |
| 21 millimeters in feet | 0.06889764 fts |
| 21 millimeters in inches | 0.8267721 in |
| 21 millimeters in nautical miles | 1.1339097E-5 NM |
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