It is: 12,008
800,012,005
68,205,012
The standard form is 12,800
Twelve thousand, two hundred thirty-eight
eight hundred twelve thousand.
Twelve thousand and eight hundred seventy
It is: 12,008
8,000,012,300
508,012
800,012,005
eight hundred twelve thousand
800,012,005
13,012,008
9,012,098
800,012,005
800,012,005