21,000,000
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You would write it like this 21,000,000 or 2.1*10^6.Another Answer:-It is the same as in scientific notation and it is: 2.1*10^7
0.86 million = 860,000
35.2 million = 35,200,000
32.2 million = 32,200,000
21. (You can use your calculator to find this actually)