There are 50,000,000 S.DICE shares on MPEx, and 37,000,000 of those are controlled by evoorhees.

When the dividend is paid, it will be in the sum of 6619 BTC, which will be divided into all 50 million shares (0.00013238 BTC per share).

I'm assuming that Erik stated 1721 BTC because he's only considering the 13,000,000 shares not held by him, however MPEx will still require him to actually pay 6619BTC to issue the dividend.