MOSCOW, Oct 19 (Reuters) - Russian gas giant Gazprom said on Tuesday it expected its revenue to reach record levels this year thanks to surging gas prices in Europe.

It also said it expected core earnings to exceed $45 billion in 2021, while cash flow was seen to be positive this year despite high dividend payouts.

(Reporting by Polina Devitt and Vladimir Soldatkin; Editing by Edmund Blair)