What is this number 1000000000000000000000000

This number is called "one septillion" in American English or "one quadrillion" in British English—the difference stems from the two distinct systems used to name large numbers. In the short scale system (used in the United States and modern British English), every new word represents a thousand times the previous value, making this 24-zero number a septillion (1,000^8). In the long scale system (historically used in British English and still used in many European countries), new number names represent a million times the previous value, making this same number a quadrillion (1,000,000^4).

To understand this number's magnitude, it's incomprehensibly large in practical terms—far exceeding any everyday application. For perspective, the estimated number of stars in the observable universe is roughly 1,000,000,000,000,000,000,000,000 (one septillion), and the estimated number of grains of sand on all Earth's beaches is only about 7.5 quintillion (18 zeros). This number appears primarily in scientific contexts like cosmology, particle physics, or theoretical mathematics rather than finance or daily life. When written out, it's "one septillion" in the US system, but due to international variations in number naming, scientists typically prefer scientific notation (1 × 10^24) to avoid confusion across different linguistic and mathematical conventions, ensuring precise communication in academic and technical fields where such enormous quantities might actually be relevant.