10806221 has 2 divisors, whose sum is σ = 10806222. Its totient is φ = 10806220.

The previous prime is 10806181. The next prime is 10806227. The reversal of 10806221 is 12260801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10432900 + 373321 = 3230^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 10806221 - 2¹⁸ = 10544077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10806193 and 10806202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10806227) 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, 5403110 + 5403111.

It is an arithmetic number, because the mean of its divisors is an integer number (5403111).

Almost surely, 2^10806221 is an apocalyptic number.

It is an amenable number.

10806221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10806221 is an equidigital number, since it uses as much as digits as its factorization.

10806221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 10806221 is about 3287.2817037790. The cubic root of 10806221 is about 221.0843231793.

The spelling of 10806221 in words is "ten million, eight hundred six thousand, two hundred twenty-one".