1122221121 has 16 divisors (see below), whose sum is σ = 1715136384. Its totient is φ = 639362304.

The previous prime is 1122221077. The next prime is 1122221143. The reversal of 1122221121 is 1211222211.

It is not a de Polignac number, because 1122221121 - 2¹¹ = 1122219073 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1122221121.

It is not an unprimeable number, because it can be changed into a prime (1122201121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72210 + ... + 86363.

It is an arithmetic number, because the mean of its divisors is an integer number (107196024).

Almost surely, 2^1122221121 is an apocalyptic number.

It is an amenable number.

1122221121 is a deficient number, since it is larger than the sum of its proper divisors (592915263).

1122221121 is a wasteful number, since it uses less digits than its factorization.

1122221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158920.

The product of its digits is 32, while the sum is 15.

The square root of 1122221121 is about 33499.5689673763. The cubic root of 1122221121 is about 1039.1848645435.

Adding to 1122221121 its reverse (1211222211), we get a palindrome (2333443332).

The spelling of 1122221121 in words is "one billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".