| 21.5 km * | 0.6213711922 mi | = 13.3594806331 mi | 
| 1 km | 
| Natuurkundige eenheid | Lengtes | 
|---|---|
| Nanometer | 2.15e+13 nm | 
| Micrometer | 21500000000.0 µm | 
| Millimeter | 21500000.0 mm | 
| Centimeter | 2150000.0 cm | 
| Inch | 846456.692913 in | 
| Voet | 70538.0577428 ft | 
| Yard | 23512.6859143 yd | 
| Meter | 21500.0 m | 
| Kilometer | 21.5 km | 
| Mijl | 13.3594806331 mi | 
| Zeemijl | 11.6090712743 nmi | 
