12320421 has 4 divisors (see below), whose sum is σ = 16427232. Its totient is φ = 8213612.

The previous prime is 12320411. The next prime is 12320431. The reversal of 12320421 is 12402321.

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: 12402321 = 3 ⋅4134107.

It is an interprime number because it is at equal distance from previous prime (12320411) and next prime (12320431).

It is a cyclic number.

It is not a de Polignac number, because 12320421 - 2¹⁰ = 12319397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12320421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053401 + ... + 2053406.

It is an arithmetic number, because the mean of its divisors is an integer number (4106808).

Almost surely, 2^12320421 is an apocalyptic number.

It is an amenable number.

12320421 is a deficient number, since it is larger than the sum of its proper divisors (4106811).

12320421 is an equidigital number, since it uses as much as digits as its factorization.

12320421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4106810.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 12320421 is about 3510.0457261979. The cubic root of 12320421 is about 230.9627008235.

Adding to 12320421 its reverse (12402321), we get a palindrome (24722742).

The spelling of 12320421 in words is "twelve million, three hundred twenty thousand, four hundred twenty-one".