11112221221121 has 32 divisors (see below), whose sum is σ = 11573579275776. Its totient is φ = 10661207040000.

The previous prime is 11112221221091. The next prime is 11112221221133. The reversal of 11112221221121 is 12112212221111.

It is a happy number.

It is not a de Polignac number, because 11112221221121 - 2¹⁰ = 11112221220097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11112221221093 and 11112221221102.

It is not an unprimeable number, because it can be changed into a prime (11112221221181) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1122328271 + ... + 1122338171.

It is an arithmetic number, because the mean of its divisors is an integer number (361674352368).

Almost surely, 2^{11112221221121} is an apocalyptic number.

It is an amenable number.

11112221221121 is a deficient number, since it is larger than the sum of its proper divisors (461358054655).

11112221221121 is a wasteful number, since it uses less digits than its factorization.

11112221221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11513.

The product of its digits is 64, while the sum is 20.

Adding to 11112221221121 its reverse (12112212221111), we get a palindrome (23224433442232).

The spelling of 11112221221121 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".