C21

Also called C7×C3.

C21 is Abelian, and is a direct product of two smaller groups.

Statistics
Order of group	21
GAP identifier	21,2
Presentation	< k \| k²¹ >
Orders of elements	1 of 1, 21 of 3, 61 of 7, 12*1 of 21
Centre	C21
Derived subgroup	1
Automorphism group	C6×C2
Inner automorphism group	1
"Out" (quotient of above)	C6×C2
Schur multiplier	1

Permutation Diagrams

Not transitive.

Not transitive.

Sharply 1-transitive
on 21 points, even.

Cayley Graphs

Index to regular maps