1121222121 has 16 divisors (see below), whose sum is σ = 1537122048. Its totient is φ = 726537600.

The previous prime is 1121222117. The next prime is 1121222171. The reversal of 1121222121 is 1212221211.

It is not a de Polignac number, because 1121222121 - 2² = 1121222117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121222121.

It is not an unprimeable number, because it can be changed into a prime (1121222171) 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, 16515 + ... + 50151.

It is an arithmetic number, because the mean of its divisors is an integer number (96070128).

Almost surely, 2^1121222121 is an apocalyptic number.

It is an amenable number.

1121222121 is a deficient number, since it is larger than the sum of its proper divisors (415899927).

1121222121 is a wasteful number, since it uses less digits than its factorization.

1121222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33952.

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

The square root of 1121222121 is about 33484.6550079286. The cubic root of 1121222121 is about 1038.8764125920.

Adding to 1121222121 its reverse (1212221211), we get a palindrome (2333443332).

It can be divided in two parts, 11212 and 22121, that added together give a palindrome (33333).

The spelling of 1121222121 in words is "one billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".