Radius of the sphere = 21 cm
Volume of the sphere `= ((4)/(3) pi r^(3))` cubic units
`= ((4)/(3) xx (22)/(7) xx 21 xx 21 xx 21) cm^(3)`
`= 38808 cm^(3)`
Surface area of the sphere `= (4pir^(2))` sq units
`= (4 xx (22)/(7) xx 21 xx 21) cm^(2) = 5544 cm^(2)`
