No one except for Youtube itself would know the exact amount of Youtubers who have 10 million subscribers.
There's 5 youtubers I know of that have way more than 10 million subscribers and those youtubers are.
- Canal KondZilla (28 million subscribers)
- HolaSoyGerman (33 million subscribers)
- JustinBieberVEVO (34 million subscribers)
- T-Series (37 million subscribers)
- PewDiePie (61 million subscribers)
I'm sure there's way more out there than that with more than 10 million subscribers but those are all I know about.