11122221 has 32 divisors (see below), whose sum is σ = 16920576. Its totient is φ = 6440000.

The previous prime is 11122219. The next prime is 11122229. The reversal of 11122221 is 12222111.

11122221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11122221 - 2¹ = 11122219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11122197 and 11122206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110071 + ... + 110171.

It is an arithmetic number, because the mean of its divisors is an integer number (528768).

Almost surely, 2^11122221 is an apocalyptic number.

11122221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11122221 is a deficient number, since it is larger than the sum of its proper divisors (5798355).

11122221 is a wasteful number, since it uses less digits than its factorization.

11122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its digits is 16, while the sum is 12.

The square root of 11122221 is about 3334.9994002998. Note that the first 3 decimals coincide. The cubic root of 11122221 is about 223.2186651764.

Adding to 11122221 its reverse (12222111), we get a palindrome (23344332).

It can be divided in two parts, 1112 and 2221, that added together give a palindrome (3333).

The spelling of 11122221 in words is "eleven million, one hundred twenty-two thousand, two hundred twenty-one".