21224403103 has 4 divisors (see below), whose sum is σ = 21347087688. Its totient is φ = 21101718520.

The previous prime is 21224403097. The next prime is 21224403113. The reversal of 21224403103 is 30130442212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21224403103 - 2²⁵ = 21190848671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224403113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61342033 + ... + 61342378.

It is an arithmetic number, because the mean of its divisors is an integer number (5336771922).

Almost surely, 2^21224403103 is an apocalyptic number.

21224403103 is a deficient number, since it is larger than the sum of its proper divisors (122684585).

21224403103 is a wasteful number, since it uses less digits than its factorization.

21224403103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122684584.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21224403103 its reverse (30130442212), we get a palindrome (51354845315).

The spelling of 21224403103 in words is "twenty-one billion, two hundred twenty-four million, four hundred three thousand, one hundred three".