A particular semiconductor in equilibrium has $1\times {10}^{16} {\mathrm{cm}}^{-3}$ donor atoms, $1.1 \times {10}^{17} {\mathrm{cm}}^{-3}$ acceptor atoms. If the intrinsic carrier density $\left(n_{\mathrm{i}}\right)$ of the semiconductor is ${10}^{12} {\mathrm{cm}}^{-3}$, then the electron density in it will be