That's a lot of zeroes.
At the moment, Apple is worth $935 billion. If the company can impress investors and continue to increase their value, they will surpass the trillion dollar mark. If it does, Apple will be the first US company to pass the trillion dollar milestone. The company's stock is up 12% this year because of high sales of the iPhone 8 and X. Warren Buffett is one of the top investors in Apple. Buffett's company Berkshire Hathaway purchased almost 75 million shares of Apple earlier this year.
Amazon, Google, and Microsoft all have a chance to beat Apple to the trillion dollar finish line. They are worth $870 billion, $845 billion, and $815 billion, respectively. Microsoft was expected to reach a trillion dollars in the late 90's, before the tech bubble burst in 2000.