21 and not 7

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Nea Filadelfia
38,03705598422, 23,7407684326172
2023

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Checking the Aek stadium and 21 is the number.

AEK stadium and Nea Filadelfia park

Aek (football) official site
Aek (football) on wikipedia: Greek, English
Park of Nea Filadelfia on greek Wikipedia and on Natura Graeca
Nea Filadelfia on Wikipedia: Greek, English
Nea Filadelfia / Nea Chalkidona municipality official site
Nea Filadelfia / Nea Chalkidona municipality on Wikipedia: Greek, English