21444431443 has 4 divisors (see below), whose sum is σ = 22136187328. Its totient is φ = 20752675560.

The previous prime is 21444431441. The next prime is 21444431471. The reversal of 21444431443 is 34413444412.

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

It is a cyclic number.

It is not a de Polignac number, because 21444431443 - 2¹ = 21444431441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21444431399 and 21444431408.

It is not an unprimeable number, because it can be changed into a prime (21444431441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345877896 + ... + 345877957.

It is an arithmetic number, because the mean of its divisors is an integer number (5534046832).

Almost surely, 2^21444431443 is an apocalyptic number.

21444431443 is a deficient number, since it is larger than the sum of its proper divisors (691755885).

21444431443 is an equidigital number, since it uses as much as digits as its factorization.

21444431443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691755884.

The product of its digits is 73728, while the sum is 34.

Adding to 21444431443 its reverse (34413444412), we get a palindrome (55857875855).

The spelling of 21444431443 in words is "twenty-one billion, four hundred forty-four million, four hundred thirty-one thousand, four hundred forty-three".