US Banking giant Citigroup (C) announced plans 21 Mar 2011 Monday to conduct a 1-for-10 reverse stock split and resume paying a quarterly dividend.The reverse stock split will slash the number of Citi’s outstanding shares to 2.9 billion from about 29 billion.Citi, which recently finished repaying its $45 billion taxpayer-funded bailout from the financial crisis, said it anticipates the reverse…