  The gamma-ray burst GRB 221009A, known as the ``brightest-of-all-time"
(BOAT), is the closest energetic burst detected so far, with an energy of
$E_{\gamma,\rm iso} \sim 10^{55}$ ergs. This study aims to assess its
compatibility with known GRB energy and luminosity distributions. Our analysis
indicates that the energy/luminosity function of GRBs is consistent across
various redshift intervals, and that the inclusion of GRB 221009A does not
significantly impact the function at low redshifts. Additionally, our
evaluation of the best-fitting result of the entire GRB sample suggests that
the expected number of GRBs with energy greater than $10^{55}$ ergs at a low
redshift is 0.2, so that the emergence of GRB 221009A is consistent with
expected energy/luminosity functions within $\sim 2\sigma$ Poisson fluctuation
error, still adhering to the principles of small number statistics.
Furthermore, we find that GRB 221009A and other energetic bursts, defined as
$E_{\gamma,\rm iso} \gtrsim10^{54} {\rm ergs}$, exhibit no significant
differences in terms of distributions of $T_{90}$, minimum timescale, Amati
relation, $E_{\rm \gamma,iso}$-$E_{\rm X,iso}$ relation, $L_{\gamma,\rm
iso}-\Gamma_0$ relation, $E_{\gamma,\rm iso}-\Gamma_0$ relation, $L_{\gamma,\rm
iso}-E_{\rm p,i}-\Gamma_0$ relation, and host galaxy properties, compared to
normal long GRBs. This suggests that energetic GRBs (including GRB 221009A) and
other long GRBs likely have similar progenitor systems and undergo similar
energy dissipation and radiation processes. The generation of energetic GRBs
may be due to more extreme central engine properties or, more likely, a rarer
viewing configuration of a quasi-universal structured jet.
