21442444311 has 16 divisors (see below), whose sum is σ = 28910838528. Its totient is φ = 14135284800.

The previous prime is 21442444273. The next prime is 21442444339. The reversal of 21442444311 is 11344424412.

It is a happy number.

It is not a de Polignac number, because 21442444311 - 2¹⁰ = 21442443287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442444391) 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 15 ways as a sum of consecutive naturals, for example, 13350 + ... + 207516.

It is an arithmetic number, because the mean of its divisors is an integer number (1806927408).

Almost surely, 2^21442444311 is an apocalyptic number.

21442444311 is a deficient number, since it is larger than the sum of its proper divisors (7468394217).

21442444311 is a wasteful number, since it uses less digits than its factorization.

21442444311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194582.

The product of its digits is 12288, while the sum is 30.

Adding to 21442444311 its reverse (11344424412), we get a palindrome (32786868723).

The spelling of 21442444311 in words is "twenty-one billion, four hundred forty-two million, four hundred forty-four thousand, three hundred eleven".