12331421 has 4 divisors (see below), whose sum is σ = 12385500. Its totient is φ = 12277344.

The previous prime is 12331391. The next prime is 12331441. The reversal of 12331421 is 12413321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12040900 + 290521 = 3470^2 + 539^2 .

It is a cyclic number.

It is not a de Polignac number, because 12331421 - 2²² = 8137117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12331421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12331441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26696 + ... + 27153.

It is an arithmetic number, because the mean of its divisors is an integer number (3096375).

Almost surely, 2^12331421 is an apocalyptic number.

It is an amenable number.

12331421 is a deficient number, since it is larger than the sum of its proper divisors (54079).

12331421 is an equidigital number, since it uses as much as digits as its factorization.

12331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54078.

The product of its digits is 144, while the sum is 17.

The square root of 12331421 is about 3511.6123077584. The cubic root of 12331421 is about 231.0314169272.

Adding to 12331421 its reverse (12413321), we get a palindrome (24744742).

The spelling of 12331421 in words is "twelve million, three hundred thirty-one thousand, four hundred twenty-one".