21303313223 has 4 divisors (see below), whose sum is σ = 21652547928. Its totient is φ = 20954078520.

The previous prime is 21303313153. The next prime is 21303313259. The reversal of 21303313223 is 32231330312.

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 21303313223 - 2⁸ = 21303312967 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 (21303213223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174617261 + ... + 174617382.

It is an arithmetic number, because the mean of its divisors is an integer number (5413136982).

Almost surely, 2^21303313223 is an apocalyptic number.

21303313223 is a deficient number, since it is larger than the sum of its proper divisors (349234705).

21303313223 is an equidigital number, since it uses as much as digits as its factorization.

21303313223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349234704.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21303313223 its reverse (32231330312), we get a palindrome (53534643535).

The spelling of 21303313223 in words is "twenty-one billion, three hundred three million, three hundred thirteen thousand, two hundred twenty-three".