11122011222221 has 16 divisors (see below), whose sum is σ = 11394591736320. Its totient is φ = 10850961461760.

The previous prime is 11122011222187. The next prime is 11122011222253. The reversal of 11122011222221 is 12222211022111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11122011222221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11122011222193 and 11122011222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122011222271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30847016 + ... + 31205486.

It is an arithmetic number, because the mean of its divisors is an integer number (712161983520).

Almost surely, 2^{11122011222221} is an apocalyptic number.

It is an amenable number.

11122011222221 is a deficient number, since it is larger than the sum of its proper divisors (272580514099).

11122011222221 is a wasteful number, since it uses less digits than its factorization.

11122011222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360604.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11122011222221 its reverse (12222211022111), we get a palindrome (23344222244332).

The spelling of 11122011222221 in words is "eleven trillion, one hundred twenty-two billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".