11221021111 has 2 divisors, whose sum is σ = 11221021112. Its totient is φ = 11221021110.

The previous prime is 11221021093. The next prime is 11221021219. The reversal of 11221021111 is 11112012211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11221021111 - 2⁷ = 11221020983 is a prime.

It is a super-2 number, since 2×11221021111² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11221021091 and 11221021100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221028111) 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, 5610510555 + 5610510556.

It is an arithmetic number, because the mean of its divisors is an integer number (5610510556).

Almost surely, 2^11221021111 is an apocalyptic number.

11221021111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221021111 is an equidigital number, since it uses as much as digits as its factorization.

11221021111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11221021111 its reverse (11112012211), we get a palindrome (22333033322).

The spelling of 11221021111 in words is "eleven billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".