It depends on what you are rounding to. 621 to the nearest 10 would be 620 while 621 to the nearest 100 would be 600.
6.21 = 621/100
15.525 = 621/40
368 = 2 x 2 x 2 x 2 x 23 621 = 3 x 3 x 3 x 23
17,003,621
62.5 = 625/10 = 621/2
17,003,621
How to write 43million,297thousand,621
In order for a number to be divisible by 6, it must be divisible by both 3 and 2. 621 is divisible by 3, but not by 2. In other words, 6 will not go into 621 evenly. The answer will be a decimal.
2 percent of 621 = 12.422% of 621= 2% * 621= 0.02 * 621= 12.42
seiscientos veintiun(o) (Omit the 'o' if it's followed by a noun)
621,428,512,953