One million of them.
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In the metric system, the prefix "mega-" denotes a factor of 1,000,000. Therefore, a megaton is equivalent to one million tons. Since a ton is equal to 2,000 pounds, a megaton is equal to 2 billion pounds. The number of zeros in a megaton is determined by the number of zeros in the numerical value of 2 billion, which is nine zeros.
47,900 pounds is 21.73 metric tons.
1 short ton = 0.9078 metric tons 1 long ton = 1.016 metric tons
12,000 pounds is 5.443 metric tons.
Megaton and ton are different things: megaton is a unit of enery; ton a unit of weight. A megaton is the energy released from detonation of TNT. A ton is 2,000 pounds.