1106821 has 2 divisors, whose sum is σ = 1106822. Its totient is φ = 1106820.

The previous prime is 1106801. The next prime is 1106827. The reversal of 1106821 is 1286011.

It is the 430-th star number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 314721 = 890^2 + 561^2 .

It is an emirp because it is prime and its reverse (1286011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1106821 - 2⁵ = 1106789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1106827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 553410 + 553411.

It is an arithmetic number, because the mean of its divisors is an integer number (553411).

2^1106821 is an apocalyptic number.

It is an amenable number.

1106821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1106821 is an equidigital number, since it uses as much as digits as its factorization.

1106821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1106821 is about 1052.0556068954. The cubic root of 1106821 is about 103.4409412028.

The spelling of 1106821 in words is "one million, one hundred six thousand, eight hundred twenty-one".