21003321223 has 2 divisors, whose sum is σ = 21003321224. Its totient is φ = 21003321222.

The previous prime is 21003321193. The next prime is 21003321239. The reversal of 21003321223 is 32212330012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21003321223 - 2⁵ = 21003321191 is a prime.

It is a super-2 number, since 2×21003321223² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003321223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003321623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501660611 + 10501660612.

It is an arithmetic number, because the mean of its divisors is an integer number (10501660612).

Almost surely, 2^21003321223 is an apocalyptic number.

21003321223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003321223 is an equidigital number, since it uses as much as digits as its factorization.

21003321223 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 21003321223 its reverse (32212330012), we get a palindrome (53215651235).

The spelling of 21003321223 in words is "twenty-one billion, three million, three hundred twenty-one thousand, two hundred twenty-three".