$$24(1111)(21)-6(111)(21)$$
$545958$
$$26664\times 21-6\times 111\times 21$$
$$559944-6\times 111\times 21$$
$$559944-666\times 21$$
$$559944-13986$$
$$545958$$
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$2\times 3^{2}\times 7^{2}\times 619$
