1121121212111 has 4 divisors (see below), whose sum is σ = 1125384030672. Its totient is φ = 1116858393552.

The previous prime is 1121121212069. The next prime is 1121121212131. The reversal of 1121121212111 is 1112121211211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121121212111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121121212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121121212131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2131408886 + ... + 2131409411.

It is an arithmetic number, because the mean of its divisors is an integer number (281346007668).

Almost surely, 2^{1121121212111} is an apocalyptic number.

1121121212111 is a deficient number, since it is larger than the sum of its proper divisors (4262818561).

1121121212111 is an equidigital number, since it uses as much as digits as its factorization.

1121121212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262818560.

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

Adding to 1121121212111 its reverse (1112121211211), we get a palindrome (2233242423322).

The spelling of 1121121212111 in words is "one trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred eleven".