The routing transit number 121135045 is officially registered to California Bank and Trust, a subsidiary of Zions Bancorporation operating across California. California Bank and Trust provides comprehensive commercial banking, corporate cash management, retail services, and wealth management solutions to businesses and individuals. This specific nine-digit code is actively utilized to handle standard automated clearing house (ACH) payments, direct payroll deposits, and electronic wire transfers. Utilizing the accurate routing number ensures that funds transfer securely and efficiently into or out of customer accounts through the federal clearing infrastructure.