21945

21945 is a prime number. It is the natural number that follows 21944 and precedes 21946. As a prime number, its only positive divisors are 1 and itself. The primality of 21945 was likely confirmed through established mathematical algorithms. Numbers with this property are fundamental in various areas of mathematics, including number theory and cryptography. The digits of 21945 sum to 2 + 1 + 9 + 4 + 5 = 21.