10566221 has 2 divisors, whose sum is σ = 10566222. Its totient is φ = 10566220.

The previous prime is 10566217. The next prime is 10566253. The reversal of 10566221 is 12266501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10562500 + 3721 = 3250^2 + 61^2 .

It is a cyclic number.

It is not a de Polignac number, because 10566221 - 2² = 10566217 is a prime.

It is a super-2 number, since 2×10566221² = 223290052441682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10566421) 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, 5283110 + 5283111.

It is an arithmetic number, because the mean of its divisors is an integer number (5283111).

Almost surely, 2^10566221 is an apocalyptic number.

It is an amenable number.

10566221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10566221 is an equidigital number, since it uses as much as digits as its factorization.

10566221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 10566221 is about 3250.5724111301. The cubic root of 10566221 is about 219.4353356875.

The spelling of 10566221 in words is "ten million, five hundred sixty-six thousand, two hundred twenty-one".