21305241103 has 4 divisors (see below), whose sum is σ = 21512088208. Its totient is φ = 21098394000.

The previous prime is 21305241049. The next prime is 21305241137. The reversal of 21305241103 is 30114250312.

It is a happy number.

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 21305241103 - 2¹³ = 21305232911 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 (21305241193) 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 3 ways as a sum of consecutive naturals, for example, 103423398 + ... + 103423603.

It is an arithmetic number, because the mean of its divisors is an integer number (5378022052).

Almost surely, 2^21305241103 is an apocalyptic number.

21305241103 is a deficient number, since it is larger than the sum of its proper divisors (206847105).

21305241103 is a wasteful number, since it uses less digits than its factorization.

21305241103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206847104.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21305241103 its reverse (30114250312), we get a palindrome (51419491415).

The spelling of 21305241103 in words is "twenty-one billion, three hundred five million, two hundred forty-one thousand, one hundred three".