1121211111121 has 4 divisors (see below), whose sum is σ = 1131497451700. Its totient is φ = 1110924770544.

The previous prime is 1121211111091. The next prime is 1121211111149. The reversal of 1121211111121 is 1211111121211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 341453235600 + 779757875521 = 584340^2 + 883039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121211111121 - 2⁵ = 1121211111089 is a prime.

It is a super-2 number, since 2×1121211111121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121211111095 and 1121211111104.

It is not an unprimeable number, because it can be changed into a prime (1121211111221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5143170126 + ... + 5143170343.

It is an arithmetic number, because the mean of its divisors is an integer number (282874362925).

Almost surely, 2^{1121211111121} is an apocalyptic number.

It is an amenable number.

1121211111121 is a deficient number, since it is larger than the sum of its proper divisors (10286340579).

1121211111121 is a wasteful number, since it uses less digits than its factorization.

1121211111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10286340578.

The product of its digits is 8, while the sum is 16.

Adding to 1121211111121 its reverse (1211111121211), we get a palindrome (2332322232332).

The spelling of 1121211111121 in words is "one trillion, one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".