Final answer:
The number 10002015 expressed as a numeral consists of eight digits.
Step-by-step explanation:
When the number 10002015 is expressed as a numeral, it is written using digits, which include 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. To determine how many digits are written, we simply count each individual numeral used to express the number. In this case, as the number 10002015 is written, we count each numeral: 1, 0, 0, 0, 2, 0, 1, 5.
Therefore, the number of digits written when 10002015 is expressed as a numeral is eight.