Write a Python function `is_divisible_by_11(n)` that determines whether a given integer `n` is divisible by 11. The function should return `True` if the number is divisible by 11, and `False` otherwise.
#### Example Usage
```python [main.nopy]
print(is_divisible_by_11(121)) # Output: True
print(is_divisible_by_11(123)) # Output: False
print(is_divisible_by_11(0)) # Output: True
```
#### Constraints
- The input `n` will be an integer.
- The function should handle both positive and negative integers.