12140321 has 4 divisors (see below), whose sum is σ = 12148500. Its totient is φ = 12132144.

The previous prime is 12140309. The next prime is 12140341. The reversal of 12140321 is 12304121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12304121 = 1747 ⋅7043.

It can be written as a sum of positive squares in 2 ways, for example, as 8059921 + 4080400 = 2839^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 12140321 - 2⁶ = 12140257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12140296 and 12140305.

It is not an unprimeable number, because it can be changed into a prime (12140341) 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, 1166 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (3037125).

Almost surely, 2^12140321 is an apocalyptic number.

It is an amenable number.

12140321 is a deficient number, since it is larger than the sum of its proper divisors (8179).

12140321 is an equidigital number, since it uses as much as digits as its factorization.

12140321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8178.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 12140321 is about 3484.2963421615. The cubic root of 12140321 is about 229.8317673360.

Adding to 12140321 its reverse (12304121), we get a palindrome (24444442).

The spelling of 12140321 in words is "twelve million, one hundred forty thousand, three hundred twenty-one".