21444004211 has 12 divisors (see below), whose sum is σ = 24949351440. Its totient is φ = 18377417520.

The previous prime is 21444004193. The next prime is 21444004261. The reversal of 21444004211 is 11240044412.

It is not a de Polignac number, because 21444004211 - 2¹⁰ = 21444003187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444004261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277181 + ... + 346001.

It is an arithmetic number, because the mean of its divisors is an integer number (2079112620).

Almost surely, 2^21444004211 is an apocalyptic number.

21444004211 is a deficient number, since it is larger than the sum of its proper divisors (3505347229).

21444004211 is an equidigital number, since it uses as much as digits as its factorization.

21444004211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75194 (or 75187 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21444004211 its reverse (11240044412), we get a palindrome (32684048623).

The spelling of 21444004211 in words is "twenty-one billion, four hundred forty-four million, four thousand, two hundred eleven".