Twenty-one faced Rudraksh represents Lord Kuber the God of wealth (related to Ek Alakh Nirnjan). It is one of the rarest of all the Rudrakshas. It is called Ek Alakh King; the Omkar(Om) itself. It is the creator and do preservation of the universe and it is the past, present and future itself.
This Rudraksha belongs to each and every Shakti (power). Lord Brahmma, Vishnu and Mahesha along with all other God and Goddess live in this Rudraksha. The person who wears this Rudraksha after proper Sidhhi will involve deeply in Bhakti.
The wearer of this Rudraksha gets all the comforts, leisure and happiness and in the end get the Moksha.