516,312,000
Twelve thousand and twelve thousandths written as a decimal is 12000.012
Twelve thousand.
12,500
Twelve Thousand.
sixteen thousand twelve and sixty-six hundredths
516,312,000
85,016,012
312,000,004,016
2,516,312,000
You have just written it - unless you mean "1,216"
sixteen thousand million. You are welcome.
16,016
Twelve and sixteen hundredths (12.16) in standard form is 1.216 × 101
12,316,158 in word form is twelve million three hundred sixteen thousand one hundred forty-eight.
Twelve thousand and twelve thousandths written as a decimal is 12000.012
I would write two thousand sixteen. Some people would say two thousand and sixteen, but to my ear the 'and' is redundant.