  We present analytical and numerical models of the bright long GRB 210822A at
$z=1.736$. The intrinsic extreme brightness exhibited in the optical, which is
very similar to other bright GRBs (e.g., GRBs 080319B, 130427A, 160625A
190114C, and 221009A), makes GRB 210822A an ideal case for studying the
evolution of this particular kind of GRB. We use optical data from the RATIR
instrument starting at $T+315.9$ s, with publicly available optical data from
other ground-based observatories, as well as Swift/UVOT, and X-ray data from
the Swift/XRT instrument. The temporal profiles and spectral properties during
the late stages align consistently with the conventional forward shock model,
complemented by a reverse shock element that dominates optical emissions during
the initial phases ($T<300$ s). Furthermore, we observe a break at $T=80000$s
that we interpreted as evidence of a jet break, which constrains the opening
angle to be about $\theta_\mathrm{j}=(3-5)$ degrees. Finally, we apply a
machine-learning technique to model the multi-wavelength light curve of GRB
210822A using the AFTERGLOWPY library. We estimate the angle of sight
$\theta_{obs}=(6.4 \pm 0.1) \times 10^{-1}$ degrees, the energy $E_0=(7.9 \pm
1.6)\times 10^{53}$ ergs, the electron index $p=2.54 \pm 0.10$, the thermal
energy fraction in electrons $\epsilon_\mathrm{e}=(4.63 \pm 0.91) \times
10^{-5}$ and in the magnetic field $\epsilon_\mathrm{B}= (8.66 \pm 1.01) \times
10^{-6}$, the efficiency $\chi = 0.89 \pm 0.01$, and the density of the
surrounding medium $n_\mathrm{0} = 0.85 \pm 0.01 cm^{-3}$.
