What is Vitaly Petrov's racing number?

I'm not sure he has a number.

This page lists all the World Grand Prix Racers from the films, each of whom has a colour scheme and a number. This list includes people like Lewis Hamilton (No. 2) and Francesco Bernoulli (No. 1).

However, this other Wikipedia page lists the racers in slightly more detail. For Jeff Gorvette (No. 24) it states:

The character does not appear in international versions of Cars 2. In two scenes (one where Lightning meets him at the party in Tokyo, and another when that scene appears in Mater's nightmare), Gorvette is replaced by a completely different character, voiced by a regionally better known racer than Jeff Gordon. Most of them share the body shape with Max Schnell and the least of them share after the body of Miguel Camino:

Mark Winterbottom as Frosty (Australian release)
Fernando Alonso as Fernando Alonso (Spanish release)
Vitaly Petrov as Vitaly Petrov (Russian release)
Jan Nilsson as Flash (Swedish release)
Unknown as Long Ge (Chinese release)
Memo Rojas as Memo Rojas, Jr. (Mexican release)
Sebastian Vettel as Sebastian Schnell (German release)
Claudia Leitte as Carla Veloso (Brazilian release) Unknown as Raoul ÇaRoule (French release)

No number is listed. Some further searching led me to this site, which is one of many selling toy replicas of the cars in the films. Unlike most of the other racers, no number is listed against Vitaly's entry, or his picture:

Additionally, stills from the film show nothing:

Therefore, I think it's safe to assume he most likely doesn't have a racing number, as he is only feature in one country's version of the film.

The official Disney.co.uk page for Vitaly Petrov shows the following image. His number was apparently 11.

Vitaly Petrov is the first and only Russian race car ever to compete in the Formula World Championship. He didn't start off as a Formula racer though. In fact, there was very little motorsport in Vitaly's hometown of Vyborg Russia, so he got most of his race training in rally sprints and ice races. After winning the Russian Rally Sprint title, he won every race in the Russian Lada Cup. Vitaly was soon on his way to the top with multiple Formula wins. With all his speed and success, it's no wonder Vitaly became known as the Vyborg Rocket.