Il numero 521, cinquecentoventuno in Italiano, in Inglese si dice five hundred twenty-one.
Il numero ordinale 521° in inglese si dice five hundred twenty-first.
512: five hundred twelve
513: five hundred thirteen
514: five hundred fourteen
515: five hundred fifteen
516: five hundred sixteen
517: five hundred seventeen
518: five hundred eighteen
519: five hundred nineteen
520: five hundred twenty
522: five hundred twenty-two
523: five hundred twenty-three
524: five hundred twenty-four
525: five hundred twenty-five
526: five hundred twenty-six
527: five hundred twenty-seven
528: five hundred twenty-eight
529: five hundred twenty-nine
530: five hundred thirty