In total , 28 Vols have worn the No. 21 .
With sophomore right - handed pitcher Trevor Bettencourt cutting his number in half from No. 42 to No. 21 this season , he will become the 29th Vol to don the jersey on Feb. 14 .
In total , 28 Vols have worn the No. 21 and with sophomore right - handed pitcher Trevor Bettencourt cutting his number in half from No. 42 to No. 21 this season , he will become the 29th Vol to don the jersey on Feb. 14 .