1. We see India as a strategic partner in the late 21st century.

Question

2. We see India as a strategic partner in the mid 21st century.

3. We see India as a strategic partner in the early 21st century.

(Are all grammatical? Can we use 'middle' instead of 'mid'?)

Answer 1

#2 = mid-21st century. "middle" is a noun = middle of the 21st century.

Sra