21323331223 has 4 divisors (see below), whose sum is σ = 21328915608. Its totient is φ = 21317746840.

The previous prime is 21323331181. The next prime is 21323331233. The reversal of 21323331223 is 32213332312.

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 21323331223 - 2⁹ = 21323330711 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 (21323331233) 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, 2786461 + ... + 2794102.

It is an arithmetic number, because the mean of its divisors is an integer number (5332228902).

Almost surely, 2^21323331223 is an apocalyptic number.

21323331223 is a deficient number, since it is larger than the sum of its proper divisors (5584385).

21323331223 is an equidigital number, since it uses as much as digits as its factorization.

21323331223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5584384.

The product of its digits is 3888, while the sum is 25.

Adding to 21323331223 its reverse (32213332312), we get a palindrome (53536663535).

The spelling of 21323331223 in words is "twenty-one billion, three hundred twenty-three million, three hundred thirty-one thousand, two hundred twenty-three".