A routing number is a routing code used to identify a financial institution in the United States. Each bank or credit union is assigned a unique nine-digit code that identifies its location and allows for the routing of funds between banks.
First Hawaiian Bank is a bank headquartered in Hawaii, and its routing number is 121102503. This routing number is used to identify the bank when sending or receiving money, and it ensures that the funds are correctly routed to or from the correct financial institution.