42 decimeters equals 4,200,000,000 nanometers.
Convert 42 decimeters into meters, kilometers, centimeters, milimeters, micrometers, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...
Convert 4200000000 nanometers into meters, kilometers, centimeters, milimeters, micrometers, picometers, inches, feet, yards, miles, hands, lightyears, astronomical units, parsecs, etc...