11122121121 has 4 divisors (see below), whose sum is σ = 14829494832. Its totient is φ = 7414747412.

The previous prime is 11122121113. The next prime is 11122121141. The reversal of 11122121121 is 12112122111.

It is a happy number.

11122121121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11122121121 - 2³ = 11122121113 is a prime.

It is a super-3 number, since 3×11122121121³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11122121121.

It is not an unprimeable number, because it can be changed into a prime (11122121141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1853686851 + ... + 1853686856.

It is an arithmetic number, because the mean of its divisors is an integer number (3707373708).

Almost surely, 2^11122121121 is an apocalyptic number.

It is an amenable number.

11122121121 is a deficient number, since it is larger than the sum of its proper divisors (3707373711).

11122121121 is an equidigital number, since it uses as much as digits as its factorization.

11122121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3707373710.

The product of its digits is 16, while the sum is 15.

Adding to 11122121121 its reverse (12112122111), we get a palindrome (23234243232).

The spelling of 11122121121 in words is "eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".