MTNL on Tuesday informed that its total default on bank loans stands at ₹5,726 crore, comprising a principal amount of ₹5,492 crore and interest worth ₹234 crore. Union Bank of India has the biggest exposure to MTNL. The total debt of the telecom firm stands at ₹32,097.28 crore, more than 40 times its consolidated annual income of ₹798 crore.