21444311441 has 24 divisors (see below), whose sum is σ = 26161084800. Its totient is φ = 17493138432.

The previous prime is 21444311423. The next prime is 21444311453. The reversal of 21444311441 is 14411344412.

It is a happy number.

It is not a de Polignac number, because 21444311441 - 2²⁶ = 21377202577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21444311491) 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 23 ways as a sum of consecutive naturals, for example, 176465 + ... + 272081.

It is an arithmetic number, because the mean of its divisors is an integer number (1090045200).

Almost surely, 2^21444311441 is an apocalyptic number.

It is an amenable number.

21444311441 is a deficient number, since it is larger than the sum of its proper divisors (4716773359).

21444311441 is a wasteful number, since it uses less digits than its factorization.

21444311441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95853 (or 95846 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

Adding to 21444311441 its reverse (14411344412), we get a palindrome (35855655853).

The spelling of 21444311441 in words is "twenty-one billion, four hundred forty-four million, three hundred eleven thousand, four hundred forty-one".