It is: 500,000,000,000 = 500 billion
29,000,000,000
580,000,000
1,600,000
3,810,000,000
1,300,000,000
It is 7,046,000,000.
7,000,000,000 is 7 billion
1,560,000,000
In digits: 1,001,001,001 (Using the accepted "short scale" billion, which equals one thousand million.)
10 digits: 1,000,000,000 is one billion dollars.
To write 2.1 billion in digits, you would write it as 2,100,000,000. This is because the number 2.1 billion consists of the numeral 2 followed by nine zeros, representing the value of one billion.