1111111121121 has 16 divisors (see below), whose sum is σ = 1577390760000. Its totient is φ = 693272964608.

The previous prime is 1111111121119. The next prime is 1111111121149. The reversal of 1111111121121 is 1211211111111.

It is a happy number.

It is not a de Polignac number, because 1111111121121 - 2¹ = 1111111121119 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 1111111121121.

It is not an unprimeable number, because it can be changed into a prime (1111111121101) 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, 60846996 + ... + 60865253.

It is an arithmetic number, because the mean of its divisors is an integer number (98586922500).

Almost surely, 2^{1111111121121} is an apocalyptic number.

It is an amenable number.

1111111121121 is a deficient number, since it is larger than the sum of its proper divisors (466279638879).

1111111121121 is a wasteful number, since it uses less digits than its factorization.

1111111121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121712448.

The product of its digits is 4, while the sum is 15.

Adding to 1111111121121 its reverse (1211211111111), we get a palindrome (2322322232232).

It can be divided in two parts, 1111111 and 121121, that multiplied together give a palindrome (134578875431).

The spelling of 1111111121121 in words is "one trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".