12245123221 has 2 divisors, whose sum is σ = 12245123222. Its totient is φ = 12245123220.

The previous prime is 12245123159. The next prime is 12245123311. The reversal of 12245123221 is 12232154221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9578536900 + 2666586321 = 97870^2 + 51639^2 .

It is a cyclic number.

It is not a de Polignac number, because 12245123221 - 2⁹ = 12245122709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12245123921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6122561610 + 6122561611.

It is an arithmetic number, because the mean of its divisors is an integer number (6122561611).

Almost surely, 2^12245123221 is an apocalyptic number.

It is an amenable number.

12245123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12245123221 is an equidigital number, since it uses as much as digits as its factorization.

12245123221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 25.

Adding to 12245123221 its reverse (12232154221), we get a palindrome (24477277442).

The spelling of 12245123221 in words is "twelve billion, two hundred forty-five million, one hundred twenty-three thousand, two hundred twenty-one".