What is 521 Divided by 21 using Long Division?

$$ \begin{array}{rl} & 024 \phantom{00} \leftarrow Quotient \\[-4pt] Divisor \rightarrow \phantom{0} 21 \kern-1ex & \kern-1ex \enclose{longdiv}{521} \phantom{0} \leftarrow Dividend \\[-4pt] & \phantom{} \underline{\phantom{} 0\phantom{0}} \\[-4pt] & \phantom{} 5 2 \\[-4pt] & \phantom{} \underline{\phantom{} 42\phantom{0}} \\[-4pt] & \phantom{} 10 1 \\[-4pt] & \phantom{} \underline{\phantom{0} 84\phantom{0}} \\[-4pt] & \phantom{0} 17 \phantom{0} \leftarrow Remainder \\[-4pt] \end{array} $$