21044442003 has 8 divisors (see below), whose sum is σ = 30217660368. Its totient is φ = 12950425824.

The previous prime is 21044441959. The next prime is 21044442019. The reversal of 21044442003 is 30024444012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21044442003 - 2¹² = 21044437907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21044442073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269800500 + ... + 269800577.

It is an arithmetic number, because the mean of its divisors is an integer number (3777207546).

Almost surely, 2^21044442003 is an apocalyptic number.

21044442003 is a deficient number, since it is larger than the sum of its proper divisors (9173218365).

21044442003 is a wasteful number, since it uses less digits than its factorization.

21044442003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539601093.

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

Adding to 21044442003 its reverse (30024444012), we get a palindrome (51068886015).

The spelling of 21044442003 in words is "twenty-one billion, forty-four million, four hundred forty-two thousand, three".