21 cubic feet = 36,288 cubic inches = 1571/11 gallons
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2.5 cubic feet = 4,320 cubic inches
16 cubic feet = 27,648 cubic inches
54,600 cubic inches = 31.6 cubic feet
You can convert from feet to inches, or from cubic feet to cubic inches, but you can't convert from cubic feet to inches.
31,104 cubic inches = 18 cubic feet.