The ISBN number you gave is wrong. The ISBN consists of ten digits. Divided into four segments by three short horizontal lines, each segment has a different meaning.

The first group number field is the area code, also known as the group identifier. The shortest number is one digit, and the longest number is five digits, generally taking into account the language, country and region. Countries and regions that voluntarily apply to participate in the ISBN system are divided into several regions, and each region has a fixed code: the country code of books published in the United States is 0; 1 stands for English, and the countries that use these two codes are: Australia, Canada, Ireland, New Zealand, Puerto Rico, South Africa, Britain, the United States, Zimbabwe and so on. Stands for French, which is used in French-speaking areas of France, Luxembourg, Belgium, Canada and Switzerland; 3 stands for German and is used in Germany, Austria and German-speaking Switzerland; 4 is the code of Japanese publications; 5 is the code of Russian national publications; 7 Codes used in Chinese mainland publications, etc. The longest country field may be five digits (for example, Bhutan is 99936), but the remaining digits that can be used and allocated are narrower.

The group number is divided into five grades, with the length of 1-5 digits, and the specific setting range is as follows:

Set the number of digits range of the group number. The number of publications allowed per group number (species). The total publication volume of each file (category) is 0 ~ 7810.80 billion, with double digits of 8 ~ 94150.10.50 billion, with three digits of 950 ~ 950+99800.50001.00000000005

The third group is that the book sequence code (title identifier) is given by the publishers themselves, and the book sequence number of each publisher is fixed (the number 9 minus the number of digits occupied by the group number and the publisher code is the number of digits of the book sequence code). The shortest one and the longest six. The bigger the publishing house, the more books published and the longer the serial number.

The fourth group is the computer parity bit, with only one digit, from 0 to 9.

Four groups of numbers should be connected by a hyphen (-) (for example, 2-02-033598-0). However, some library integration systems can't automatically assign hyphens, and library catalogers don't know much about the segmentation of ISBN, so people often omit hyphens in bibliographic records (for example, 2020335980).