Descended Master No.21/21= In the bible, No. 21 symbolizes the greater wickedness of rebellion and sin. You see, after the children of Israel left Egyptian bondage, they had 21 major rebellious events take place as they traveled and wondered the wilderness.
The number 13 symbolizes depravity and sinfulness in the bible, and No. 21 is closely related to it. This is because the meaning of twenty-one is an outgrowth of thirteen. The simple numerological fact is that adding No. 13's sinfulness to No. 8's symbolism of a new beginning gives us the No. 21's message of beginning a new level of effort that is sinful and disobedient against God.
On the last day of Gods' seven-day spring festival, which falls on the 21st day of Nisan, the Eternal carried out his last judgement against the Egyptians. He drowned the Pharaoh and his entire army in the red sea as they were pursuing the Israelites in order to make them slaves once again.
I should also note that the Last Great Day of Gods' annual fall Feast of Tabernacles occurs every year on the 21st day of the seventh Hebrew month, and it represents the resurrection of the Children of Israel in the World Tomorrow, but before this happens, we see that the devil that deceived them was cast into the lake of fire and brimstone (Revelation 20:10).
In Revelation 20:7, we find that when the 1,000-year imprisonment of Satan in the bottomless pit expires, Ey shall go out to deceive the nations in all four corners of the earth descended from Gog and Ma'gog in order to gather them together for battle, and their numbers will be like the sands of the sea.