21909441103 has 4 divisors (see below), whose sum is σ = 23901208488. Its totient is φ = 19917673720.

The previous prime is 21909441097. The next prime is 21909441137. The reversal of 21909441103 is 30114490912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21909441103 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 (21909441173) 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, 995883676 + ... + 995883697.

It is an arithmetic number, because the mean of its divisors is an integer number (5975302122).

Almost surely, 2^21909441103 is an apocalyptic number.

21909441103 is a deficient number, since it is larger than the sum of its proper divisors (1991767385).

21909441103 is a wasteful number, since it uses less digits than its factorization.

21909441103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991767384.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 21909441103 in words is "twenty-one billion, nine hundred nine million, four hundred forty-one thousand, one hundred three".