12331121 has 4 divisors (see below), whose sum is σ = 13452144. Its totient is φ = 11210100.

The previous prime is 12331097. The next prime is 12331127. The reversal of 12331121 is 12113321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12113321 = 11 ⋅1101211.

It is a de Polignac number, because none of the positive numbers 2^k-12331121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12331096 and 12331105.

It is not an unprimeable number, because it can be changed into a prime (12331127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560495 + ... + 560516.

It is an arithmetic number, because the mean of its divisors is an integer number (3363036).

Almost surely, 2^12331121 is an apocalyptic number.

12331121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12331121 is a deficient number, since it is larger than the sum of its proper divisors (1121023).

12331121 is a wasteful number, since it uses less digits than its factorization.

12331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121022.

The product of its digits is 36, while the sum is 14.

The square root of 12331121 is about 3511.5695920770. The cubic root of 12331121 is about 231.0295433938.

Adding to 12331121 its reverse (12113321), we get a palindrome (24444442).

It can be divided in two parts, 12 and 331121, that added together give a palindrome (331133).

The spelling of 12331121 in words is "twelve million, three hundred thirty-one thousand, one hundred twenty-one".