11221009 has 2 divisors, whose sum is σ = 11221010. Its totient is φ = 11221008.

The previous prime is 11220997. The next prime is 11221043. The reversal of 11221009 is 90012211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10419984 + 801025 = 3228^2 + 895^2 .

It is an emirp because it is prime and its reverse (90012211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221009 is a prime.

It is a super-2 number, since 2×11221009² = 251822085956162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11220983 and 11221001.

It is not a weakly prime, because it can be changed into another prime (11221069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610504 + 5610505.

It is an arithmetic number, because the mean of its divisors is an integer number (5610505).

Almost surely, 2^11221009 is an apocalyptic number.

It is an amenable number.

11221009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221009 is an equidigital number, since it uses as much as digits as its factorization.

11221009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 11221009 is about 3349.7774552946. Note that the first 3 decimals coincide. The cubic root of 11221009 is about 223.8775970823.

The spelling of 11221009 in words is "eleven million, two hundred twenty-one thousand, nine".