1121312121 has 16 divisors (see below), whose sum is σ = 1536621504. Its totient is φ = 726801984.

The previous prime is 1121312117. The next prime is 1121312141. The reversal of 1121312121 is 1212131211.

It is not a de Polignac number, because 1121312121 - 2² = 1121312117 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 1121312121.

It is not an unprimeable number, because it can be changed into a prime (1121312141) 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, 195531 + ... + 201183.

It is an arithmetic number, because the mean of its divisors is an integer number (96038844).

Almost surely, 2^1121312121 is an apocalyptic number.

It is an amenable number.

1121312121 is a deficient number, since it is larger than the sum of its proper divisors (415309383).

1121312121 is a wasteful number, since it uses less digits than its factorization.

1121312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7480.

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

The square root of 1121312121 is about 33485.9988801290. The cubic root of 1121312121 is about 1038.9042085639.

Adding to 1121312121 its reverse (1212131211), we get a palindrome (2333443332).

The spelling of 1121312121 in words is "one billion, one hundred twenty-one million, three hundred twelve thousand, one hundred twenty-one".