* TSX ends up 0.6% at 21,363.61

* Posts gain of 1.6% for the month

* CNQ rallies 5.1% on earnings beat

* TD and CIBC beat estimates

Feb 29 (Reuters) - Canada's main stock index rallied on Thursday, adding to its monthly gain, as investors cheered results from Canadian Natural Resources and the major banks as well as domestic data showing stronger-than-expected economic growth.

Toronto Stock Exchange's S&P/TSX composite index ended up 119.84 points, or 0.6%, at 21,363.61.

For the month, it was up 1.6%, its fourth straight monthly gain. That's the longest monthly winning streak since 2021.

"Today's all about CNQ," said Barry Schwartz, portfolio manager at Baskin Financial Services. "The company has become a dividend king."

Shares of Canadian Natural Resources jumped 5.1% after the company beat estimates for fourth-quarter profit on record production, and raised its quarterly dividend by 5%.

The energy sector rose 1.9%, while heavily weighted financials added 0.7% after TD Bank and Canadian Imperial Bank of Commerce reported better than expected earnings. TD shares added 1.1% and CIBC was up 2.2%.

"There's a little sigh of relief that the (banks') outlooks aren't worsening yet," Schwartz said.

The Canadian economy exceeded expectations in the fourth quarter, with GDP expanding at an annualized rate of 1%. Investors also weighed U.S. inflation data that kept a midyear interest rate cut from the Federal Reserve on the table.

The materials sector, which includes precious and base metals miners and fertilizer companies, contributed to the rally. It gained 1% as gold and copper prices rose. (Reporting by Fergal Smith in Toronto and Purvi Agarwal in Bengaluru; Editing by Ravi Prakash Kumar and Jonathan Oatis)