The manufacturer's instructions for an autoclave (sterilizing unit) in a clinic specify that the autoclave must reach a temperature of 121 °C under 15 pounds per square inch of pressure for a minimum of 15 minutes to ensure sterilization. The technician who is doing routine maintenance on the machine will check the operating temperature using a Fahrenheit thermometer, the autoclave is working properly the temperature should be __________ (round to the nearest whole number).