21444042003 has 4 divisors (see below), whose sum is σ = 28592056008. Its totient is φ = 14296028000.

The previous prime is 21444041999. The next prime is 21444042007. The reversal of 21444042003 is 30024044412.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21444041999) and next prime (21444042007).

It is a cyclic number.

It is not a de Polignac number, because 21444042003 - 2² = 21444041999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444042007) 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, 3574006998 + ... + 3574007003.

It is an arithmetic number, because the mean of its divisors is an integer number (7148014002).

Almost surely, 2^21444042003 is an apocalyptic number.

21444042003 is a deficient number, since it is larger than the sum of its proper divisors (7148014005).

21444042003 is an equidigital number, since it uses as much as digits as its factorization.

21444042003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7148014004.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21444042003 its reverse (30024044412), we get a palindrome (51468086415).

The spelling of 21444042003 in words is "twenty-one billion, four hundred forty-four million, forty-two thousand, three".