523323443221 has 2 divisors, whose sum is σ = 523323443222. Its totient is φ = 523323443220.

The previous prime is 523323443213. The next prime is 523323443273. The reversal of 523323443221 is 122344323325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308663580625 + 214659862596 = 555575^2 + 463314^2 .

It is a cyclic number.

It is not a de Polignac number, because 523323443221 - 2³ = 523323443213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523323443021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261661721610 + 261661721611.

It is an arithmetic number, because the mean of its divisors is an integer number (261661721611).

Almost surely, 2^523323443221 is an apocalyptic number.

It is an amenable number.

523323443221 is a deficient number, since it is larger than the sum of its proper divisors (1).

523323443221 is an equidigital number, since it uses as much as digits as its factorization.

523323443221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 34.

Adding to 523323443221 its reverse (122344323325), we get a palindrome (645667766546).

The spelling of 523323443221 in words is "five hundred twenty-three billion, three hundred twenty-three million, four hundred forty-three thousand, two hundred twenty-one".