6 groups of order 42021.
| SmallGroups | group |
|---|---|
| (42021, 1) | C7×C9×C23×C29 #53726751 |
| (42021, 2) | C9×C23×C29⋊C7 #53726752 |
| (42021, 3) | C23×C29×C7⋊C9 #53726753 |
| (42021, 4) | C32×C7×C23×C29 #53726754 |
| (42021, 5) | C32×C23×C29⋊C7 #53726755 |
| (42021, 6) | C3×ΓL(1,𝔽8)×C23×C29 #53726756 |