The least common multiple of these numbers is 441.
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The Least Common Multiple of 21, 63, 147: 441
LCD(49, 21) = 147
LCD(9, 21) = 63
There is none because the Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.
If you mean lcm, it is 36 because 9 x 4 equals 36 and 3 x 12 equals 36.