$$21z { 73 }^{ 2 }$$
$111909z$
$$21z\times 5329$$
$$111909z$$
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$111909$
$$\frac{\mathrm{d}}{\mathrm{d}z}(21z\times 5329)$$
$$\frac{\mathrm{d}}{\mathrm{d}z}(111909z)$$
$$111909z^{1-1}$$
$$111909z^{0}$$
$$111909\times 1$$
$$111909$$