Extensions 1→N→G→Q→1 with N=C₂₁ and Q=C₂₁

Direct product G=N×Q with N=C₂₁ and Q=C₂₁

		d	ρ	Label	ID
C₂₁²		441		C21^2	441,13

Semidirect products G=N:Q with N=C₂₁ and Q=C₂₁

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂₁⋊C₂₁ = C₇⋊C₃×C₂₁	φ: C₂₁/C₇ → C₃ ⊆ Aut C₂₁	63	3	C21:C21	441,10

Non-split extensions G=N.Q with N=C₂₁ and Q=C₂₁

extension	φ:Q→Aut N	d	ρ	Label	ID
C₂₁.C₂₁ = C₇×C₇⋊C₉	φ: C₂₁/C₇ → C₃ ⊆ Aut C₂₁	63	3	C21.C21	441,5

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Extensions 1→N→G→Q→1 with N=C21 and Q=C21