What is 420 Divided by 21 using Long Division?

$$ \begin{array}{rl} & 020 \phantom{00} \leftarrow Quotient \\[-4pt] Divisor \rightarrow \phantom{0} 21 \kern-1ex & \kern-1ex \enclose{longdiv}{420} \phantom{0} \leftarrow Dividend \\[-4pt] & \phantom{} \underline{\phantom{} 0\phantom{0}} \\[-4pt] & \phantom{} 4 2 \\[-4pt] & \phantom{} \underline{\phantom{} 42\phantom{0}} \\[-4pt] & \phantom{0} 0 0 \\[-4pt] & \phantom{00} \underline{\phantom{} 0\phantom{0}} \\[-4pt] & \phantom{00} 0 \phantom{0} \leftarrow Remainder \\[-4pt] \end{array} $$