21444311443 has 4 divisors (see below), whose sum is σ = 21738069208. Its totient is φ = 21150553680.

The previous prime is 21444311423. The next prime is 21444311453. The reversal of 21444311443 is 34411344412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21444311443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21444311423) 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, 146878773 + ... + 146878918.

It is an arithmetic number, because the mean of its divisors is an integer number (5434517302).

Almost surely, 2^21444311443 is an apocalyptic number.

21444311443 is a deficient number, since it is larger than the sum of its proper divisors (293757765).

21444311443 is an equidigital number, since it uses as much as digits as its factorization.

21444311443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293757764.

The product of its digits is 18432, while the sum is 31.

Adding to 21444311443 its reverse (34411344412), we get a palindrome (55855655855).

The spelling of 21444311443 in words is "twenty-one billion, four hundred forty-four million, three hundred eleven thousand, four hundred forty-three".