  Properties of the 62,336,617 Steiner triple systems of order 21 with a
non-trivial automorphism group are examined. In particular, there are 28 which
have no parallel class, six that are 4-chromatic, five that are 3-balanced, 20
that avoid the mitre, 21 that avoid the crown, one that avoids the hexagon and
two that avoid the prism. All systems contain the grid. None have a block
intersection graph that is 3-existentially closed.
