21243221103 has 16 divisors (see below), whose sum is σ = 30647662976. Its totient is φ = 13010790240.

The previous prime is 21243221099. The next prime is 21243221113. The reversal of 21243221103 is 30112234212.

It is not a de Polignac number, because 21243221103 - 2² = 21243221099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21243221103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243221113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1282525 + ... + 1298982.

It is an arithmetic number, because the mean of its divisors is an integer number (1915478936).

Almost surely, 2^21243221103 is an apocalyptic number.

21243221103 is a deficient number, since it is larger than the sum of its proper divisors (9404441873).

21243221103 is a wasteful number, since it uses less digits than its factorization.

21243221103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581734.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21243221103 its reverse (30112234212), we get a palindrome (51355455315).

The spelling of 21243221103 in words is "twenty-one billion, two hundred forty-three million, two hundred twenty-one thousand, one hundred three".