Strange error in python3 when doing big int calculation

I was trying to do this in Python 3.5.2:

int(204221389795918291262976/10000)

but got the unexpected result: 20422138979591827456

It's working fine in Python 2.7.12, result is: 20422138979591829126L

Any idea why Python 3 gave me the wrong result?

Copyright Notice：Content Author:「EricY」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/39308302/strange-error-in-python3-when-doing-big-int-calculation

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