(8.1 * 10 to the 12th power * 5.3 * 10
$${\mathtt{8.1}}{\mathtt{\,\times\,}}{{\mathtt{10}}}^{{\mathtt{12}}}{\mathtt{\,\times\,}}{\mathtt{5.3}}{\mathtt{\,\times\,}}{\mathtt{10}} = {\mathtt{429\,300\,000\,000\,000}}$$