That depends on what scale your country is using (long of short scale)
For the long scale 12.4 trillion would be 12'400'000'000'000'000'000
And for the short scale it would be 12'400'000'000'000
Information about short and long scales can be found on Wikipedia over here:
http://en.wikipedia.org/wiki/Long_and_short_scales
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2.2 trillion written in numbers is 2,200,000,000,000.
360 trillion is 360,000,000,000,000
1.1 trillion = 1,100,000,000,000
1.12 trillion written in numbers is 1,120,000,000,000.
You would write it as 22,000,000,000,000.