1112121121121 has 2 divisors, whose sum is σ = 1112121121122. Its totient is φ = 1112121121120.

The previous prime is 1112121121099. The next prime is 1112121121171. The reversal of 1112121121121 is 1211211212111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 939842997025 + 172278124096 = 969455^2 + 415064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1112121121121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1112121121121.

It is not a weakly prime, because it can be changed into another prime (1112121121171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556060560560 + 556060560561.

It is an arithmetic number, because the mean of its divisors is an integer number (556060560561).

Almost surely, 2^{1112121121121} is an apocalyptic number.

It is an amenable number.

1112121121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1112121121121 is an equidigital number, since it uses as much as digits as its factorization.

1112121121121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16, while the sum is 17.

Adding to 1112121121121 its reverse (1211211212111), we get a palindrome (2323332333232).

The spelling of 1112121121121 in words is "one trillion, one hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".