21000 nanometers equals 21 micrometers.
Convert 21000 nanometers into meters, kilometers, decimeters, centimeters, milimeters, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...
Convert 22 micrometers into meters, kilometers, decimeters, centimeters, milimeters, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...