521 = DXXI
I write 620 billion as 620 billion.
Sixteen point two billion is how I would write it.
You write 3.56 billion as 3,560,000,000.
You can write 40.3 billion as 40,300,000,000.
Five hundred and twenty one billions or billion In scientific notation it is: 5.21*1011
521 = DXXI
It is 521.
52.1 as a fraction is 521/10
I write 620 billion as 620 billion.
Sixteen point two billion is how I would write it.
521/1000
You write 3.56 billion as 3,560,000,000.
You can write 40.3 billion as 40,300,000,000.
You can write out 1.8 billion as "1,800,000,000" or "one billion eight hundred million."
Since you asked how I would write the number, the answer is 1031.
1,000 billion billion is: 1,000,000,000,000,000,000,000