On a historical note: This massive bomb is the same weight as the British designed and built ‘Grand Slam’ bomb of WW2 that was used against the German submarine pens — 22,000 pounds.
See: https://en.wikipedia.org/wiki/Grand_Slam_(bomb)
Also, whereas the MOAB is dropped from a C-130 transport, modified Lancaster bombers carried and dropped the Grand Slam.
I believe the grand slam was a penetrator and this one isn’t.