The correct term for ten hundred billion is one trillion, which is 1,000,000,000,000 in numbers.
10,300,000,000 or ten billion, three-hundred million.
110,000,000,000 or one hundred ten billion.
ten billion six hundred eighty-six million one hundred thousand
Since you asked how I would write the number, the answer is 1031.
Ten hundred thousand is a thousand thousand which is a million = 1,000,000