Mulank: the day, and only the day
Take the day of the month and add its digits until one digit is left. Born on the 4th, your Mulank is 4. Born on the 27th, 2 plus 7 is 9. Born on the 29th, 2 plus 9 is 11, and 1 plus 1 is 2. Mulank is always between 1 and 9 — no day from 1 to 31 can survive as a master number, because the reduction here does not stop at 11, 22 or 33. Your month and year are ignored completely.