Demiprismatorhombated icosiheptaheptacontadipeton

The demiprismatorhombated icosiheptaheptacontadipeton or haprojak, also called the demiruncicantellated 221 polytope, is a convex uniform polypeton. It consists of 27 prismatotruncated demipenteracts, 27 bitruncated triacontaditera, 72 prismatorhombated hexatera, and 216 decachoric prisms. 2 prismatotruncated demipenteracts, 1 bitruncated triacontaditeron, 2 prismatorhombated hexatera, and 2 decachoric prisms join at each vertex. As the name suggests, it is the demiruncicantellation of the icosiheptaheptacontadipeton.