Conversation so far:
how many countries in the world speak arabic
There are 25 countries that claim Arabic as an official or co-official language.
What's the total number of Arabic speakers?
Arabic and its different dialects are spoken by around 422 million speakers.
Geographically, where are Arabic speakers concentrated?
The majority of Arabic speakers are concentrated in North Africa, the Arabian Peninsula and the Middle East, known as the Arab world.

Question: Which country has the most?
Self-contained rewrite: Which country has the most Arabic speakers?