The number twenty-one represents a turning point in your life and your full transition into adulthood. It is also associated with the responsibilities that you need to own up to. Alternatively, twenty-one suggests that you will be lucky at a game of blackjack.
The number 21 represents conflict with confrontation. You may have a problem standing up to something.
To dream of the number 10 million represents powerful or dramatic negative situations where your are experiencing a new beginning. Something new happening that you may find really unpleasant to be unable to control.
Alternatively, 10 million may reflect awareness of yourself having to be arrogant or dangerous in order to make a fresh start.
Example: A woman dreamed of ten million people dying in a city. In waking life she was in the hospital and discovered that her condition had become more serious. The 10 million people dying in the explosion may have reflected her fear of not being able to inform everyone she knew about the negative change in her condition before surgery was to occur. Her fear of everyone she knew thinking she might be dying.