21 seconds in minutes
Result
The conversion result is: 21 seconds is equivalent to 0.35 minutes.[1]
Conversion formula
How to convert 21 seconds to minutes?
We know (by definition) that: 1 sec ≈ 0.016666667 min.
We can set up a proportion to solve for the number of minutes.
1 sec / 21 sec ≈ 0.016666667 min / x min
Now, we cross multiply to solve for our unknown x:
x min ≈ (21 sec / 1 sec) * 0.016666667 min → x min ≈ 0.350000007 min
Conclusion:
21 sec ≈ 0.350000007 min
Conversion in the opposite direction
The inverse of the conversion factor is that 1 minute is equal to 2.85714285714286 times 21 seconds.
It can also be expressed as: 21 seconds is equal to 1 / 2.85714285714286 minutes.
Approximation
An approximate numerical result would be: twenty-one seconds is about zero minutes, or alternatively, a minute is about two point eight five times twenty-one seconds.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.