21442344223 has 4 divisors (see below), whose sum is σ = 21463512408. Its totient is φ = 21421176040.

The previous prime is 21442344211. The next prime is 21442344293. The reversal of 21442344223 is 32244324412.

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 21442344223 - 2¹³ = 21442336031 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442344293) 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, 10582573 + ... + 10584598.

It is an arithmetic number, because the mean of its divisors is an integer number (5365878102).

Almost surely, 2^21442344223 is an apocalyptic number.

21442344223 is a deficient number, since it is larger than the sum of its proper divisors (21168185).

21442344223 is a wasteful number, since it uses less digits than its factorization.

21442344223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21168184.

The product of its digits is 36864, while the sum is 31.

Adding to 21442344223 its reverse (32244324412), we get a palindrome (53686668635).

The spelling of 21442344223 in words is "twenty-one billion, four hundred forty-two million, three hundred forty-four thousand, two hundred twenty-three".