11222021221 has 32 divisors (see below), whose sum is σ = 12047978880. Its totient is φ = 10435488000.

The previous prime is 11222021203. The next prime is 11222021233. The reversal of 11222021221 is 12212022211.

It is a happy number.

11222021221 is digitally balanced in base 2, 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 11222021221 - 2¹¹ = 11222019173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222021195 and 11222021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222021201) 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 in 31 ways as a sum of consecutive naturals, for example, 19117290 + ... + 19117876.

It is an arithmetic number, because the mean of its divisors is an integer number (376499340).

Almost surely, 2^11222021221 is an apocalyptic number.

It is an amenable number.

11222021221 is a deficient number, since it is larger than the sum of its proper divisors (825957659).

11222021221 is a wasteful number, since it uses less digits than its factorization.

11222021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11222021221 its reverse (12212022211), we get a palindrome (23434043432).

The spelling of 11222021221 in words is "eleven billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".