Demiprismatotruncated icosiheptaheptacontadipeton

The demiprismatotruncated icosiheptaheptacontadipeton or hopitjak, also called the demiruncitruncated 221 polytope, is a convex uniform polypeton. It consists of 27 prismatorhombated demipenteracts, 27 small rhombated demipenteracts, 72 prismatotruncated hexatera, and 216 rectified pentachoric prisms. 2 prismatorhombated demipenteracts, 1 small rhombated demipenteract, 3 prismatotruncated hexatera, and 1 rectified pentachoric prism join at each vertex. As the name suggests, it is the demiruncitruncation of the icosiheptaheptacontadipeton.