Oh, dude, you write 21 million 521 thousand 21 as 21,521,021. It's like counting to a really big number but with commas to make it look fancy. So, just slap those commas in there and you're good to go!
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15,021,000
21, 300, 000
Twenty-one million, two-thousand nine-hundred fourty-three.
63,021,002
It could mean: 21,286,000