11121155 has 4 divisors (see below), whose sum is σ = 13345392. Its totient is φ = 8896920.

The previous prime is 11121139. The next prime is 11121163. The reversal of 11121155 is 55112111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55112111 = 43 ⋅1281677.

It is not a de Polignac number, because 11121155 - 2⁴ = 11121139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1112111 + ... + 1112120.

It is an arithmetic number, because the mean of its divisors is an integer number (3336348).

Almost surely, 2^11121155 is an apocalyptic number.

11121155 is a deficient number, since it is larger than the sum of its proper divisors (2224237).

11121155 is an equidigital number, since it uses as much as digits as its factorization.

11121155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224236.

The product of its digits is 50, while the sum is 17.

The square root of 11121155 is about 3334.8395763515. The cubic root of 11121155 is about 223.2115335463.

Adding to 11121155 its reverse (55112111), we get a palindrome (66233266).

The spelling of 11121155 in words is "eleven million, one hundred twenty-one thousand, one hundred fifty-five".