The benchmark BSE Sensex today recovered 123 points to 21,156 in early trade on emergence of buying by funds and retail investors amid a firming Asian trend.The National Stock Exchange index Nifty moved up 40 points to 6,282.In the Asian region, Hong Kong's Hang Seng rose 0.65 per cent while Japan's Nikkei was up 1.77 per cent in early trade today.The US Dow Jones Industrial Average ended higher by 0.71 per cent in yesterday's trade.