1121121111111 has 16 divisors (see below), whose sum is σ = 1627762051200. Its totient is φ = 683660059488.

The previous prime is 1121121111107. The next prime is 1121121111133. The reversal of 1121121111111 is 1111111211211.

It is a happy number.

It is not a de Polignac number, because 1121121111111 - 2² = 1121121111107 is a prime.

1121121111111 is a modest number, since divided by 1111111 gives 112112 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121121111181) 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, 339115441 + ... + 339118746.

It is an arithmetic number, because the mean of its divisors is an integer number (101735128200).

Almost surely, 2^{1121121111111} is an apocalyptic number.

1121121111111 is a deficient number, since it is larger than the sum of its proper divisors (506640940089).

1121121111111 is a wasteful number, since it uses less digits than its factorization.

1121121111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678234238.

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

Adding to 1121121111111 its reverse (1111111211211), we get a palindrome (2232232322322).

It can be divided in two parts, 11211211 and 11111, that multiplied together give a palindrome (124567765421).

The spelling of 1121121111111 in words is "one trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".