What is 84 Divided by 4 using Long Division?

$$ \begin{array}{rl} & 21 \phantom{00} \leftarrow Quotient \\[-4pt] Divisor \rightarrow \phantom{0} 4 \kern-1ex & \kern-1ex \enclose{longdiv}{84} \phantom{0} \leftarrow Dividend \\[-4pt] & \phantom{} \underline{\phantom{} 8\phantom{0}} \\[-4pt] & \phantom{} 0 4 \\[-4pt] & \phantom{0} \underline{\phantom{} 4\phantom{0}} \\[-4pt] & \phantom{0} 0 \phantom{0} \leftarrow Remainder \\[-4pt] \end{array} $$