* Inches to Feet: There are 12 inches in a foot, so a trillion inches is equal to 1,000,000,000,000 inches / 12 inches/foot = 83,333,333,333.33 feet.

* Feet to Miles: There are 5,280 feet in a mile, so 83,333,333,333.33 feet is equal to 83,333,333,333.33 feet / 5,280 feet/mile = 15,782,828.28 miles (approximately).

Therefore, a trillion inches is approximately 15,782,828 miles.