None, since there can be no conversion.
A cubit = 1.5 feet so 2.1 cubit feet is a measure of area in 2-dimensional space while a foot is a measure of length in 1-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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1 cubit = 1.5 feet so 1 cubit feet is an area of 1.5 square feet.
1 cubit = 1.5 feet so 1 cubit foot is an area of 1.5 square feet.
512 feet squared
Square feet are a measure of area. A square is a flat thing with no vokume. Cubit feet don't exist. Cubic feet are a measure of volume. There is no way of expressing a volume in units of area.