11133121 has 4 divisors (see below), whose sum is σ = 11171412. Its totient is φ = 11094832.

The previous prime is 11133119. The next prime is 11133137. The reversal of 11133121 is 12133111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12133111 = 73 ⋅166207.

It can be written as a sum of positive squares in 2 ways, for example, as 10627600 + 505521 = 3260^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 11133121 - 2¹ = 11133119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11133191) 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, 18706 + ... + 19291.

It is an arithmetic number, because the mean of its divisors is an integer number (2792853).

Almost surely, 2^11133121 is an apocalyptic number.

It is an amenable number.

11133121 is a deficient number, since it is larger than the sum of its proper divisors (38291).

11133121 is an equidigital number, since it uses as much as digits as its factorization.

11133121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38290.

The product of its digits is 18, while the sum is 13.

The square root of 11133121 is about 3336.6331833152. The cubic root of 11133121 is about 223.2915609604.

Adding to 11133121 its reverse (12133111), we get a palindrome (23266232).

The spelling of 11133121 in words is "eleven million, one hundred thirty-three thousand, one hundred twenty-one".