¿What is the temperature increment conversion of 21 Kelvin in degrees Farenheit?

A change of 21 Kelvin corresponds to a change of 37.8 degrees Farenheit.

Twenty-one Kelvin equals to minus four hundred twenty-one degrees Farenheit. *Approximately

A temperature change of twenty-one Kelvin equals to a change of thirty-seven degree Farenheit. *Aproximado