11121021121 has 16 divisors (see below), whose sum is σ = 13560117120. Its totient is φ = 8903082240.

The previous prime is 11121021089. The next prime is 11121021151. The reversal of 11121021121 is 12112012111.

It is a happy number.

It is not a de Polignac number, because 11121021121 - 2⁵ = 11121021089 is a prime.

It is a super-2 number, since 2×11121021121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121021151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341106 + ... + 372283.

It is an arithmetic number, because the mean of its divisors is an integer number (847507320).

Almost surely, 2^11121021121 is an apocalyptic number.

It is an amenable number.

11121021121 is a deficient number, since it is larger than the sum of its proper divisors (2439095999).

11121021121 is a wasteful number, since it uses less digits than its factorization.

11121021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713544.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11121021121 its reverse (12112012111), we get a palindrome (23233033232).

The spelling of 11121021121 in words is "eleven billion, one hundred twenty-one million, twenty-one thousand, one hundred twenty-one".