12213026521 has 2 divisors, whose sum is σ = 12213026522. Its totient is φ = 12213026520.

The previous prime is 12213026479. The next prime is 12213026543. The reversal of 12213026521 is 12562031221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8433850896 + 3779175625 = 91836^2 + 61475^2 .

It is a cyclic number.

It is not a de Polignac number, because 12213026521 - 2⁷ = 12213026393 is a prime.

It is not a weakly prime, because it can be changed into another prime (12213066521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106513260 + 6106513261.

It is an arithmetic number, because the mean of its divisors is an integer number (6106513261).

Almost surely, 2^12213026521 is an apocalyptic number.

It is an amenable number.

12213026521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12213026521 is an equidigital number, since it uses as much as digits as its factorization.

12213026521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 12213026521 its reverse (12562031221), we get a palindrome (24775057742).

The spelling of 12213026521 in words is "twelve billion, two hundred thirteen million, twenty-six thousand, five hundred twenty-one".