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# Which number is not in scientific notation? 11 ⋅ 10^21 5.7 ⋅ 10^9 3.1 ⋅ 10^−12 1.67 ⋅ 10^−5

Which number is not in scientific notation? 11 ⋅ 10^21 5.7 ⋅ 10^9 3.1 ⋅ 10^−12 1.67 ⋅ 10^−5