Great prismated icosiheptaheptacontadipeton

The great prismated icosiheptaheptacontadipeton or gapjak, also called the runcicantitruncated 221 polytope, is a convex uniform polypeton. It consists of 27 great prismated triacontaditera, 27 great birhombated penteracts, 72 great prismated hexatera, 216 great rhombated pentachoric prisms, and 720 triangular-hexagonal duoprismatic prisms. 2 great prismated triacontaditera, 1 great birhombated penteract, 1 great prismated hexateron, 1 great rhombated pentachoric prism, and 1 triangular-hexagonal duoprismatic prism join at each vertex. As the name suggests, it is the runcicantitruncation of the icosiheptaheptacontadipeton.