21444344203 has 2 divisors, whose sum is σ = 21444344204. Its totient is φ = 21444344202.

The previous prime is 21444344189. The next prime is 21444344287. The reversal of 21444344203 is 30244344412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444344203 - 2²¹ = 21442247051 is a prime.

It is not a weakly prime, because it can be changed into another prime (21444344303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722172101 + 10722172102.

It is an arithmetic number, because the mean of its divisors is an integer number (10722172102).

Almost surely, 2^21444344203 is an apocalyptic number.

21444344203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444344203 is an equidigital number, since it uses as much as digits as its factorization.

21444344203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 21444344203 its reverse (30244344412), we get a palindrome (51688688615).

The spelling of 21444344203 in words is "twenty-one billion, four hundred forty-four million, three hundred forty-four thousand, two hundred three".