21678 is a Postal Code in Kent County.
- 21678 a.k.a. Abutilon eremitopetalum, commonly known as the Hidden-petaled Abutilon or Hiddenpetal Indian Mallow, is a species of flowering shrub in the mallow family, Malvaceae. It is endemic to dry forests and low shrublands on the windward side of the island of Lānaʻi in Hawaii. It is classified by the IUCN Red List as critically endangered by habitat destruction. The species was first discovered in 1987.
- 21678 a.k.a. For the Love of Ray J is a dating show on VH1 featuring hip hop singer Ray J. The program has a format similar to Flavor of Love, I Love New York, and Rock of Love.
- 21678 a.k.a. Tead3 is a protein.
- also known as TEA domain family member 3, DTEF-1, TEF-5, TEAD-3, ETFR-1, Tcf13r2