Find the biggest number in the following array and output its index.
[2, 13, 7, 17, 4]
The biggest number in the array is 17 and its index is 3.
Complete the following task based on the instruction and optional input provided.### Instruction:
Find the biggest number in the following array and output its index.

### Input:
[2, 13, 7, 17, 4]

### Output:
The biggest number in the array is 17 and its index is 3.