The carrier for this number is probably XL
In NATIONAL format, aka ITU-T Recommendation E123, the number is written 0877-120-122
Likewise, in E123 INTERNATIONAL formal, it is written +62 877-120-122
In E.164 standard format, the number is written +62877120122. E164 format is as per E123 INTERNATIONAL format but with no formatting applied.
In RFC3966 standard format, the number is written tel:+62-877-120-122. FC3966 is as per INTERNATIONAL format, but with all spaces and other separating symbols replaced with a hyphen, and with any phone number extension appended with ";ext=". It also will have a prefix of "tel:" added .
To dial this number from within the United States, one would dial 011 62 877-120-122
To dial this number from inside the United Kingdom or the European Union, one would dial 00 62 877-120-122
Numbers like +62877120122 may be located in the Asia/Jakarta timezone, where the local time is currently Thursday the 30th of March 2023 12:56:23 PM.