As a number: 21,000,000,000 = 21 billion
2,000,000,000
4.5 billion in standard form is 4,500,000,000
To write in two different standard forms: 2,000,000,611 or 2000000611
6 bilion
10.
$2 bilion
1.3 bilion
5.7224 bilion
Yes, it is.
its bismut - 20 bilion bilion yrs and from isotopes its Selenium SE-82 (130,000,000,000,000,000,000 years or simply 130 quintillion years)
it is roughly about 7 bilion but it keeps growing
the swirass family fortune is 6.2 bilion $