12455221 has 2 divisors, whose sum is σ = 12455222. Its totient is φ = 12455220.

The previous prime is 12455189. The next prime is 12455227. The reversal of 12455221 is 12255421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6275025 + 6180196 = 2505^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 12455221 - 2⁵ = 12455189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12455192 and 12455201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12455227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6227610 + 6227611.

It is an arithmetic number, because the mean of its divisors is an integer number (6227611).

Almost surely, 2^12455221 is an apocalyptic number.

It is an amenable number.

12455221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12455221 is an equidigital number, since it uses as much as digits as its factorization.

12455221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 800, while the sum is 22.

The square root of 12455221 is about 3529.1955173949. The cubic root of 12455221 is about 231.8019824920.

The spelling of 12455221 in words is "twelve million, four hundred fifty-five thousand, two hundred twenty-one".