2222211121 has 8 divisors (see below), whose sum is σ = 2417823464. Its totient is φ = 2030123520.

The previous prime is 2222211001. The next prime is 2222211149. The reversal of 2222211121 is 1211122222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 422754721 + 1799456400 = 20561^2 + 42420^2 .

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 2222211121 - 2⁹ = 2222210609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2222211095 and 2222211104.

It is not an unprimeable number, because it can be changed into a prime (2222211221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 879870 + ... + 882391.

It is an arithmetic number, because the mean of its divisors is an integer number (302227933).

Almost surely, 2^2222211121 is an apocalyptic number.

It is an amenable number.

2222211121 is a deficient number, since it is larger than the sum of its proper divisors (195612343).

2222211121 is a wasteful number, since it uses less digits than its factorization.

2222211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762371.

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

The square root of 2222211121 is about 47140.3343327134. The cubic root of 2222211121 is about 1304.9537073952.

Adding to 2222211121 its reverse (1211122222), we get a palindrome (3433333343).

The spelling of 2222211121 in words is "two billion, two hundred twenty-two million, two hundred eleven thousand, one hundred twenty-one".