11121120121 has 4 divisors (see below), whose sum is σ = 11125645200. Its totient is φ = 11116595044.

The previous prime is 11121120107. The next prime is 11121120133. The reversal of 11121120121 is 12102112111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11121120121 - 2²⁹ = 10584249209 is a prime.

It is a super-3 number, since 3×11121120121³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11121120161) 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, 2258851 + ... + 2263768.

It is an arithmetic number, because the mean of its divisors is an integer number (2781411300).

Almost surely, 2^11121120121 is an apocalyptic number.

It is an amenable number.

11121120121 is a deficient number, since it is larger than the sum of its proper divisors (4525079).

11121120121 is an equidigital number, since it uses as much as digits as its factorization.

11121120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4525078.

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

Adding to 11121120121 its reverse (12102112111), we get a palindrome (23223232232).

The spelling of 11121120121 in words is "eleven billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".