21420 kilometers equals 21,420,000,000,000,000 nanometers.
Convert 21420 kilometers into meters, decimeters, centimeters, milimeters, micrometers, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...
Convert 2.142E+16 nanometers into meters, decimeters, centimeters, milimeters, micrometers, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...