Actually I don't know how many altcoin are in the cryptocurrency world. but i know just listed on coinmarketcap have more then 1320 types altcoin.
Just you see here: https://coinmarketcap.com/all/views/all/
Coinmarketcap is largest coin market.But there are many new ICOs coming and there coin added another exchange site.I see etherdelta exchange site added new coin everyweek.So I really don't know how many coin in crypto world Just you see here: https://coinmarketcap.com/all/views/all/
