With this information, you can calculate the quantity of seconds 21 minutes is equal to.

¿What is the inverse calculation between 1 second and 21 minutes?

Performing the inverse calculation of the relationship between units, we obtain that 1 second is 0.00079365079 times 21 minutes.

Which is the same to say that 21 minutes is 1260 seconds.

Twenty-one minutes equals to one thousand two hundred sixty seconds. *Approximation

A second is zero times twenty-one minutes. *Approximation