The $2021^{st}$ digit at the right of the decimal point in the decimal expression of $\dfrac{2}{7}$ is~\uline{~~~~~~~~~~}~. 
Overseas Competition->Knowledge Point->Calculation Modules->Decimals->Basic Understanding of Decimals
$$\frac{2}{7}=0.\overline{285714}$$, it is a decimal which repeats in cycles of $6$ digits. Every $6$$^{th}$ digit is $4$. The $2022$$$^{nd}$$ digit is $4$, so the $2021$$^{st}$ digit is $1$. 