CREATE TABLE table_name_5 (planetary_mass___m INTEGER, rv__cm_s_ VARCHAR(255), period__days_ VARCHAR(255))
What is the highest planetary mass having an RV (cm/s) of 65 and a Period (days) less than 21?
    
SQL: SELECT MAX(planetary_mass___m) AS ⊕__ FROM table_name_5 WHERE rv__cm_s_ = 65 AND period__days_ < 21