12423252221 has 2 divisors, whose sum is σ = 12423252222. Its totient is φ = 12423252220.

The previous prime is 12423252187. The next prime is 12423252229. The reversal of 12423252221 is 12225232421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9922152100 + 2501100121 = 99610^2 + 50011^2 .

It is an emirp because it is prime and its reverse (12225232421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12423252221 - 2¹⁴ = 12423235837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12423252229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6211626110 + 6211626111.

It is an arithmetic number, because the mean of its divisors is an integer number (6211626111).

Almost surely, 2^12423252221 is an apocalyptic number.

It is an amenable number.

12423252221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12423252221 is an equidigital number, since it uses as much as digits as its factorization.

12423252221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 26.

Adding to 12423252221 its reverse (12225232421), we get a palindrome (24648484642).

The spelling of 12423252221 in words is "twelve billion, four hundred twenty-three million, two hundred fifty-two thousand, two hundred twenty-one".