21300444203 has 4 divisors (see below), whose sum is σ = 21300760800. Its totient is φ = 21300127608.

The previous prime is 21300444173. The next prime is 21300444223. The reversal of 21300444203 is 30244400312.

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 21300444203 - 2²⁰ = 21299395627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300444223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12803 + ... + 206796.

It is an arithmetic number, because the mean of its divisors is an integer number (5325190200).

Almost surely, 2^21300444203 is an apocalyptic number.

21300444203 is a deficient number, since it is larger than the sum of its proper divisors (316597).

21300444203 is an equidigital number, since it uses as much as digits as its factorization.

21300444203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316596.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21300444203 its reverse (30244400312), we get a palindrome (51544844515).

The spelling of 21300444203 in words is "twenty-one billion, three hundred million, four hundred forty-four thousand, two hundred three".