21323001223 has 2 divisors, whose sum is σ = 21323001224. Its totient is φ = 21323001222.

The previous prime is 21323001151. The next prime is 21323001251. The reversal of 21323001223 is 32210032312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21323001223 - 2³³ = 12733066631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21323001223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323001263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661500611 + 10661500612.

It is an arithmetic number, because the mean of its divisors is an integer number (10661500612).

Almost surely, 2^21323001223 is an apocalyptic number.

21323001223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323001223 is an equidigital number, since it uses as much as digits as its factorization.

21323001223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21323001223 its reverse (32210032312), we get a palindrome (53533033535).

The spelling of 21323001223 in words is "twenty-one billion, three hundred twenty-three million, one thousand, two hundred twenty-three".