12506006221 has 2 divisors, whose sum is σ = 12506006222. Its totient is φ = 12506006220.

The previous prime is 12506006153. The next prime is 12506006231. The reversal of 12506006221 is 12260060521.

12506006221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9642258025 + 2863748196 = 98195^2 + 53514^2 .

It is a cyclic number.

It is not a de Polignac number, because 12506006221 - 2¹⁵ = 12505973453 is a prime.

It is a super-3 number, since 3×12506006221³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12506006231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6253003110 + 6253003111.

It is an arithmetic number, because the mean of its divisors is an integer number (6253003111).

Almost surely, 2^12506006221 is an apocalyptic number.

It is an amenable number.

12506006221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12506006221 is an equidigital number, since it uses as much as digits as its factorization.

12506006221 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 12506006221 its reverse (12260060521), we get a palindrome (24766066742).

The spelling of 12506006221 in words is "twelve billion, five hundred six million, six thousand, two hundred twenty-one".