11001221009 has 2 divisors, whose sum is σ = 11001221010. Its totient is φ = 11001221008.

The previous prime is 11001221003. The next prime is 11001221039. The reversal of 11001221009 is 90012210011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6390403600 + 4610817409 = 79940^2 + 67903^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001221009 - 2⁸ = 11001220753 is a prime.

It is not a weakly prime, because it can be changed into another prime (11001221003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500610504 + 5500610505.

It is an arithmetic number, because the mean of its divisors is an integer number (5500610505).

Almost surely, 2^11001221009 is an apocalyptic number.

It is an amenable number.

11001221009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001221009 is an equidigital number, since it uses as much as digits as its factorization.

11001221009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 11001221009 in words is "eleven billion, one million, two hundred twenty-one thousand, nine".