1122122121 has 16 divisors (see below), whose sum is σ = 1601606400. Its totient is φ = 696694608.

The previous prime is 1122122117. The next prime is 1122122123. The reversal of 1122122121 is 1212212211.

It is not a de Polignac number, because 1122122121 - 2² = 1122122117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1122122121.

It is not an unprimeable number, because it can be changed into a prime (1122122123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163471 + ... + 170196.

It is an arithmetic number, because the mean of its divisors is an integer number (100100400).

Almost surely, 2^1122122121 is an apocalyptic number.

It is an amenable number.

1122122121 is a deficient number, since it is larger than the sum of its proper divisors (479484279).

1122122121 is a wasteful number, since it uses less digits than its factorization.

1122122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333748.

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

The square root of 1122122121 is about 33498.0913038340. The cubic root of 1122122121 is about 1039.1543054065.

Adding to 1122122121 its reverse (1212212211), we get a palindrome (2334334332).

The spelling of 1122122121 in words is "one billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".