11111000221 has 2 divisors, whose sum is σ = 11111000222. Its totient is φ = 11111000220.

The previous prime is 11111000213. The next prime is 11111000227. The reversal of 11111000221 is 12200011111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6766872121 + 4344128100 = 82261^2 + 65910^2 .

It is an emirp because it is prime and its reverse (12200011111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111000221 - 2³ = 11111000213 is a prime.

It is a super-2 number, since 2×11111000221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11111000198 and 11111000207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111000227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555500110 + 5555500111.

It is an arithmetic number, because the mean of its divisors is an integer number (5555500111).

Almost surely, 2^11111000221 is an apocalyptic number.

It is an amenable number.

11111000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111000221 is an equidigital number, since it uses as much as digits as its factorization.

11111000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 11111000221 its reverse (12200011111), we get a palindrome (23311011332).

The spelling of 11111000221 in words is "eleven billion, one hundred eleven million, two hundred twenty-one", and thus it is an aban number.