21344442223 has 4 divisors (see below), whose sum is σ = 22986322408. Its totient is φ = 19702562040.

The previous prime is 21344442199. The next prime is 21344442241. The reversal of 21344442223 is 32224444312.

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 21344442223 - 2³³ = 12754507631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344442253) 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, 820940073 + ... + 820940098.

It is an arithmetic number, because the mean of its divisors is an integer number (5746580602).

Almost surely, 2^21344442223 is an apocalyptic number.

21344442223 is a deficient number, since it is larger than the sum of its proper divisors (1641880185).

21344442223 is a wasteful number, since it uses less digits than its factorization.

21344442223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641880184.

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

Adding to 21344442223 its reverse (32224444312), we get a palindrome (53568886535).

The spelling of 21344442223 in words is "twenty-one billion, three hundred forty-four million, four hundred forty-two thousand, two hundred twenty-three".