$$\sqrt{4\times7^{21}+(7^{21}-1)^{2}}$$
$558545864083284008$
$$\sqrt{4\times 558545864083284007+\left(7^{21}-1\right)^{2}}$$
$$\sqrt{2234183456333136028+\left(7^{21}-1\right)^{2}}$$
$$\sqrt{2234183456333136028+\left(558545864083284007-1\right)^{2}}$$
$$\sqrt{2234183456333136028+558545864083284006^{2}}$$
$$\sqrt{2234183456333136028+311973482284542370184238593655408036}$$
$$\sqrt{311973482284542372418422049988544064}$$
$$558545864083284008$$
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$2^{3}\times 43\times 113\times 911\times 51031\times 309079$
