\(2^{91}=\left(2^{13}\right)^7=8192^7\)
\(5^{35}=\left(5^5\right)^7=3125^7\)
\(8192>3125\Rightarrow8192^7>3125^7=2^{91}>5^{35}\)
\(21^{12}=\left(21^3\right)^4=9261^4\)
\(54< 9261\Rightarrow54^4< 9261^4\Rightarrow54^4< 21^{12}\)
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