11222222221 has 8 divisors (see below), whose sum is σ = 12826304064. Its totient is φ = 9618367200.

The previous prime is 11222222161. The next prime is 11222222227. The reversal of 11222222221 is 12222222211.

11222222221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11222222221 - 2¹⁷ = 11222091149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222222227) 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 7 ways as a sum of consecutive naturals, for example, 67446 + ... + 164296.

It is an arithmetic number, because the mean of its divisors is an integer number (1603288008).

Almost surely, 2^11222222221 is an apocalyptic number.

It is an amenable number.

11222222221 is a deficient number, since it is larger than the sum of its proper divisors (1604081843).

11222222221 is an equidigital number, since it uses as much as digits as its factorization.

11222222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113411.

The product of its digits is 256, while the sum is 19.

Adding to 11222222221 its reverse (12222222211), we get a palindrome (23444444432).

The spelling of 11222222221 in words is "eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".