12165221 has 2 divisors, whose sum is σ = 12165222. Its totient is φ = 12165220.

The previous prime is 12165199. The next prime is 12165277. The reversal of 12165221 is 12256121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7214596 + 4950625 = 2686^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 12165221 - 2²² = 7970917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12165193 and 12165202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12165281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6082610 + 6082611.

It is an arithmetic number, because the mean of its divisors is an integer number (6082611).

Almost surely, 2^12165221 is an apocalyptic number.

It is an amenable number.

12165221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12165221 is an equidigital number, since it uses as much as digits as its factorization.

12165221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 12165221 is about 3487.8676867106. The cubic root of 12165221 is about 229.9887896237.

The spelling of 12165221 in words is "twelve million, one hundred sixty-five thousand, two hundred twenty-one".