Comment by Arcten

For such a "lingua franca" the pure number of speakers is not quite as relevant as the distribution of those speakers. According to the numbers (https://en.wikipedia.org/wiki/List_of_languages_by_total_num...), approximately 14% of the world speaks English as a first or second language as well. More importantly, English has 400 million more speakers who speak it as a second language when compared to Mandarin, which suggests that its speakers are more widely distributed on Earth.