After centillion, the next number in the series of large numbers is the googol, which is represented by the number 1 followed by 100 zeros.

In the standard naming system for large numbers, each number has a suffix indicating the number of zeros it contains. For example, the prefix “kilo-” means thousand, so a kilogram is equal to 1000 grams. Similarly, the prefix “mega-” means million, so a megabyte is equal to 1 million bytes.
Using this system, the number 1 with 6 zeros (1,000,000) is known as a million, while the number 1 with 9 zeros (1,000,000,000) is known as a billion. Continuing this pattern, the number 1 with 12 zeros (1,000,000,000,000) is known as a trillion, and the number 1 with 15 zeros (1,000,000,000,000,000) is known as a quadrillion.
As the numbers get larger, the prefixes become more complex. For example, the number 1 with 21 zeros (1,000,000,000,000,000,000,000) is known as a sextillion, while the number 1 with 27 zeros (1,000,000,000,000,000,000,000,000) is known as an octillion.
The centillion is a number with 303 zeros, making it an incredibly large number. However, there are many numbers that are even larger than the centillion. After the centillion, the next number in the series is the googol, which is 1 followed by 100 zeros.
The googol was first introduced by mathematician Edward Kasner in the 1930s, as a way to illustrate the concept of large numbers. Since then, it has become a popular topic in mathematics and popular culture, often appearing in science fiction and other media.
In addition to the googol, there are many other large numbers that have been defined and studied by mathematicians. Some of these numbers, such as the googolplex (1 followed by a googol zeros) and the TREE(3) number (a large number that arises in the study of graph theory), are so large that they are difficult to even conceptualize.
In conclusion, after the centillion, the next number in the series of large numbers is the googol, which is represented by the number 1 followed by 100 zeros. While the centillion is an incredibly large number, there are many other numbers that are even larger and more complex, and which continue to fascinate mathematicians and the general public alike.