| 21 kilometers in meters | 21000 ms |
| 21 kilometers in decimeters | 210000 dms |
| 21 kilometers in centimeters | 2100000 cms |
| 21 kilometers in millimeters | 21000000 mms |
| 21 kilometers in miles | 13.048791 mis |
| 21 kilometers in yards | 22965.81 yds |
| 21 kilometers in feet | 68897.64 fts |
| 21 kilometers in inches | 826772.1 in |
| 21 kilometers in nautical miles | 11.339097 NM |
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