21999999

21999999 is a large prime number. It is the smallest prime number with nine digits that ends in the digit 9 and contains the digit 2. Its discovery as a prime number is noted in various mathematical databases and lists of large primes. The primality of 21999999 has been verified using computational algorithms.

The number is of interest within the field of number theory, particularly in the study of prime number distribution and the search for new prime numbers. Its specific structure, featuring repeated nines and a leading two, makes it a unique specimen for computational analysis. Mathematicians and enthusiasts often explore such numbers to test the efficiency of primality tests and to contribute to the ever-growing catalog of known prime numbers.

As a prime number, 21999999 has only two distinct positive divisors: 1 and itself. This property is fundamental to its mathematical significance. Its magnitude places it within the realm of large numbers commonly encountered in cryptographic applications and theoretical research. The process of verifying its primality involves advanced computational methods that can efficiently determine if a number is prime or composite.