2100 kilojoules equals 2.1 megajoules.
Convert 2100 kilojoules into joules, calories, newton meters, foot pounds, watt hours, kilowatt hours, megawatt hours, mega electrons, etc...
Convert 3 megajoules into joules, calories, newton meters, foot pounds, watt hours, kilowatt hours, megawatt hours, mega electrons, etc...