Use the form below to do your conversion.
Solution
Step1
Log2116991=Log(16991) ÷ Log(21)
Log(16991)= 4.2302189398874
Log(21)=1.3222192947339
Log2116991=4.2302189398874 ÷ 1.3222192947339
Ans=3.1993323321898
Step2
Alternatively, the logarithm can be calculated like this.