12305221 has 2 divisors, whose sum is σ = 12305222. Its totient is φ = 12305220.

The previous prime is 12305213. The next prime is 12305231. The reversal of 12305221 is 12250321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9696996 + 2608225 = 3114^2 + 1615^2 .

It is an emirp because it is prime and its reverse (12250321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12305221 - 2³ = 12305213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12305195 and 12305204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12305231) 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, 6152610 + 6152611.

It is an arithmetic number, because the mean of its divisors is an integer number (6152611).

Almost surely, 2^12305221 is an apocalyptic number.

It is an amenable number.

12305221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12305221 is an equidigital number, since it uses as much as digits as its factorization.

12305221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 12305221 is about 3507.8798440083. The cubic root of 12305221 is about 230.8676803216.

Adding to 12305221 its reverse (12250321), we get a palindrome (24555542).

The spelling of 12305221 in words is "twelve million, three hundred five thousand, two hundred twenty-one".