1123211121 has 16 divisors (see below), whose sum is σ = 1504526400. Its totient is φ = 745361408.

The previous prime is 1123211099. The next prime is 1123211129. The reversal of 1123211121 is 1211123211.

It is a cyclic number.

It is not a de Polignac number, because 1123211121 - 2¹⁸ = 1122948977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1123211121.

It is not an unprimeable number, because it can be changed into a prime (1123211129) 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 15 ways as a sum of consecutive naturals, for example, 796465 + ... + 797873.

It is an arithmetic number, because the mean of its divisors is an integer number (94032900).

Almost surely, 2^1123211121 is an apocalyptic number.

It is an amenable number.

1123211121 is a deficient number, since it is larger than the sum of its proper divisors (381315279).

1123211121 is a wasteful number, since it uses less digits than its factorization.

1123211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448.

The product of its digits is 24, while the sum is 15.

The square root of 1123211121 is about 33514.3420194997. The cubic root of 1123211121 is about 1039.4903571118.

Adding to 1123211121 its reverse (1211123211), we get a palindrome (2334334332).

The spelling of 1123211121 in words is "one billion, one hundred twenty-three million, two hundred eleven thousand, one hundred twenty-one".