$${ 50 }^{ 2 } { 91 }^{ 2 } { 21 }^{ 2 }$$
$9129802500$
$$2500\times 91^{2}\times 21^{2}$$
$$2500\times 8281\times 21^{2}$$
$$20702500\times 21^{2}$$
$$20702500\times 441$$
$$9129802500$$
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$2^{2}\times 3^{2}\times 5^{4}\times 7^{4}\times 13^{2}$
