Music By Numbers: Rihanna

Clara Amfo uses numbers to find out more about Rihanna's career, calculating the maths behind the music to discover how her success adds up.

Like how many records has she sold across the globe? How much did one fan pay for the chance to sing with Rihanna? And how many times did the star sing the word 'work' on her last tour?

We speak to a host of fans, collaborators and brands who give us the lowdown on all things Rihanna - including a fan who she danced with on stage, the director behind the famous Umbrella music video and the man who discovered Rihanna in Barbados.