The bank starting with 021 is the credit card center of China Bank of Communications (Bank of Communications, referred to as "Bank of Communications").

Details:

1. Point 1: Bank Code

The first three digits in the bank code are usually used to identify the bank. "021" is the bank code of China Bank of Communications, indicating that the bank starting with 021 belongs to China Bank of Communications.

2. Second point: Bank of Communications of China

Bank of Communications of China is one of the five largest state-owned commercial banks in China. It was founded in 1908 and is headquartered in Shanghai, China. As a national bank, Bank of Communications of China has branches and service outlets in many cities in China, providing comprehensive financial services to individuals and businesses.

3. The third point: Credit Card Center

The Credit Card Center of China Bank of Communications is the department responsible for issuing and managing the bank’s credit card business. As a credit card center, it is responsible for processing credit card applications, limit adjustments, bill management, points activities and other related businesses, as well as providing credit card-related customer services.

Summary:

To sum up, the bank starting with 021 is the credit card center of China Bank of Communications. As part of China Bank of Communications, the Credit Card Center is responsible for managing and processing the bank's credit card business and providing customers with convenient credit card services.

Extended information:

The Bank of Communications of China was founded in 1908 and is one of the oldest and largest commercial banks in China. It provides diversified financial services including personal banking, corporate banking, and financial market services. As a state-owned commercial bank, Bank of Communications of China has branches and service outlets across the country and is committed to providing efficient and safe financial services to our customers.

Additional information:

If no specific bank name or only bank code is provided in the question, we can assume that specific content is missing from the information and provide a possible answer in the answer . In reality, the bank code is usually associated with the name of the bank, so the bank code starting with 021 can be judged to be the Bank of Communications of China.