12320223521 has 2 divisors, whose sum is σ = 12320223522. Its totient is φ = 12320223520.

The previous prime is 12320223463. The next prime is 12320223533. The reversal of 12320223521 is 12532202321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12226830625 + 93392896 = 110575^2 + 9664^2 .

It is a cyclic number.

It is not a de Polignac number, because 12320223521 - 2¹⁸ = 12319961377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (12320223571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160111760 + 6160111761.

It is an arithmetic number, because the mean of its divisors is an integer number (6160111761).

Almost surely, 2^12320223521 is an apocalyptic number.

It is an amenable number.

12320223521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12320223521 is an equidigital number, since it uses as much as digits as its factorization.

12320223521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 12320223521 its reverse (12532202321), we get a palindrome (24852425842).

The spelling of 12320223521 in words is "twelve billion, three hundred twenty million, two hundred twenty-three thousand, five hundred twenty-one".