$${ 51 }^{ 2 } { 50 }^{ 2 } { 54 }^{ 2 } { 21 }^{ 2 }$$
$8361928890000$
$$2601\times 50^{2}\times 54^{2}\times 21^{2}$$
$$2601\times 2500\times 54^{2}\times 21^{2}$$
$$6502500\times 54^{2}\times 21^{2}$$
$$6502500\times 2916\times 21^{2}$$
$$18961290000\times 21^{2}$$
$$18961290000\times 441$$
$$8361928890000$$
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$2^{4}\times 3^{10}\times 5^{4}\times 7^{2}\times 17^{2}$