Considering my father's gambling addiction, I never thought that I'd ever grow up to be a blackjack dealer. 
Wow. Interesting. The game is also called twenty-one, where on has to  compare card game between usually several players and a dealer
Nobody serious about the game calls it 21 though, except for maybe kids learning to count.
Blackjack
Blackjack is the American variant of a globally popular banking game known as Twenty-One, whose relatives include Pontoon and Vingt-et-Un. It is a comparing card game between one or more players and a dealer, where each player in turn competes against the dealer. Players do not compete against each other. It is played with one or more decks of 52 cards, and is the most widely played casino banking game in the world. The objective of the game is to beat the dealer in one
Power blackjack
Power Blackjack is a variant of the card gambling game Blackjack, modified by certain doubling and splitting rules, called "Power Double" and "Power Split," that are advantageous to the player, offset by the rule that, when the dealer makes a total of twenty two, any active player hands push rather than winning.
Basic rules.
The rules for the power blackjack game are based on the standard Blackjack rules and involve common Blackjack terms.
Rules variations.
The main variations are