11217121 has 2 divisors, whose sum is σ = 11217122. Its totient is φ = 11217120.

The previous prime is 11217103. The next prime is 11217181. The reversal of 11217121 is 12171211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9000000 + 2217121 = 3000^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 11217121 - 2⁷ = 11216993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11217095 and 11217104.

It is not a weakly prime, because it can be changed into another prime (11217181) 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, 5608560 + 5608561.

It is an arithmetic number, because the mean of its divisors is an integer number (5608561).

Almost surely, 2^11217121 is an apocalyptic number.

It is an amenable number.

11217121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11217121 is an equidigital number, since it uses as much as digits as its factorization.

11217121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28, while the sum is 16.

The square root of 11217121 is about 3349.1970679552. The cubic root of 11217121 is about 223.8517367624.

Adding to 11217121 its reverse (12171211), we get a palindrome (23388332).

The spelling of 11217121 in words is "eleven million, two hundred seventeen thousand, one hundred twenty-one".