11121121 has 16 divisors (see below), whose sum is σ = 12804480. Its totient is φ = 9560320.

The previous prime is 11121083. The next prime is 11121139. The reversal of 11121121 is 12112111.

11121121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-11121121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121098 and 11121107.

It is not an unprimeable number, because it can be changed into a prime (11121421) 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, 28395 + ... + 28783.

It is an arithmetic number, because the mean of its divisors is an integer number (800280).

Almost surely, 2^11121121 is an apocalyptic number.

11121121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11121121 is a deficient number, since it is larger than the sum of its proper divisors (1683359).

11121121 is a wasteful number, since it uses less digits than its factorization.

11121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536.

The product of its digits is 4, while the sum is 10.

The square root of 11121121 is about 3334.8344786511. The cubic root of 11121121 is about 223.2113060759.

Adding to 11121121 its reverse (12112111), we get a palindrome (23233232).

It can be divided in two parts, 11 and 121121, that multiplied together give a palindrome (1332331).

The spelling of 11121121 in words is "eleven million, one hundred twenty-one thousand, one hundred twenty-one".