There are 8 groups in the 2010 World Cup in South Africa, each group has 4 teams, and each team has an average of 21 players. How many players will participate in this World Cup?
2010年南非世界杯足球赛小组赛共有8个组，每小组有4个队，每队平均有21名运动员，这次世界杯一共有多少名运动员参加比赛？
<gadget id="calculator">21 * 4 * 8</gadget>
<output>672</output>

<result>672</result>