21444344243 has 8 divisors (see below), whose sum is σ = 25797707520. Its totient is φ = 17413452360.

The previous prime is 21444344203. The next prime is 21444344287. The reversal of 21444344243 is 34244344412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21444344243 - 2³⁰ = 20370602419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21444344203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80617703 + ... + 80617968.

It is an arithmetic number, because the mean of its divisors is an integer number (3224713440).

Almost surely, 2^21444344243 is an apocalyptic number.

21444344243 is a deficient number, since it is larger than the sum of its proper divisors (4353363277).

21444344243 is a wasteful number, since it uses less digits than its factorization.

21444344243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161235697.

The product of its digits is 147456, while the sum is 35.

Adding to 21444344243 its reverse (34244344412), we get a palindrome (55688688655).

The spelling of 21444344243 in words is "twenty-one billion, four hundred forty-four million, three hundred forty-four thousand, two hundred forty-three".