11021221217 has 2 divisors, whose sum is σ = 11021221218. Its totient is φ = 11021221216.

The previous prime is 11021221207. The next prime is 11021221231. The reversal of 11021221217 is 71212212011.

It is a happy number.

11021221217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8986850401 + 2034370816 = 94799^2 + 45104^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021221217 - 2⁴ = 11021221201 is a prime.

It is a super-2 number, since 2×11021221217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11021221207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510610608 + 5510610609.

It is an arithmetic number, because the mean of its divisors is an integer number (5510610609).

Almost surely, 2^11021221217 is an apocalyptic number.

It is an amenable number.

11021221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021221217 is an equidigital number, since it uses as much as digits as its factorization.

11021221217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 11021221217 its reverse (71212212011), we get a palindrome (82233433228).

The spelling of 11021221217 in words is "eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred seventeen".