text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_2079664_3 (previous_br_no VARCHAR, number VARCHAR)
  ### Question:
  Name the total number of previous br number for number 21
  ### Answer:
  SELECT COUNT(previous_br_no) FROM table_2079664_3 WHERE number = "21"