222111121 has 4 divisors (see below), whose sum is σ = 233801200. Its totient is φ = 210421044.

The previous prime is 222111091. The next prime is 222111133. The reversal of 222111121 is 121111222.

222111121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121111222 = 2 ⋅60555611.

It is a cyclic number.

It is not a de Polignac number, because 222111121 - 2¹⁷ = 221980049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222111151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5845011 + ... + 5845048.

It is an arithmetic number, because the mean of its divisors is an integer number (58450300).

Almost surely, 2^222111121 is an apocalyptic number.

It is an amenable number.

222111121 is a deficient number, since it is larger than the sum of its proper divisors (11690079).

222111121 is a wasteful number, since it uses less digits than its factorization.

222111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11690078.

The product of its digits is 16, while the sum is 13.

The square root of 222111121 is about 14903.3929358385. The cubic root of 222111121 is about 605.6059052911.

Adding to 222111121 its reverse (121111222), we get a palindrome (343222343).

It can be divided in two parts, 22211 and 1121, that added together give a palindrome (23332).

The spelling of 222111121 in words is "two hundred twenty-two million, one hundred eleven thousand, one hundred twenty-one".