21444002003 has 4 divisors (see below), whose sum is σ = 21942699768. Its totient is φ = 20945304240.

The previous prime is 21444001981. The next prime is 21444002029. The reversal of 21444002003 is 30020044412.

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 21444002003 - 2¹⁰ = 21444000979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444002303) 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, 249348818 + ... + 249348903.

It is an arithmetic number, because the mean of its divisors is an integer number (5485674942).

Almost surely, 2^21444002003 is an apocalyptic number.

21444002003 is a deficient number, since it is larger than the sum of its proper divisors (498697765).

21444002003 is an equidigital number, since it uses as much as digits as its factorization.

21444002003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498697764.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21444002003 its reverse (30020044412), we get a palindrome (51464046415).

The spelling of 21444002003 in words is "twenty-one billion, four hundred forty-four million, two thousand, three".