12031321 has 4 divisors (see below), whose sum is σ = 12057552. Its totient is φ = 12005092.

The previous prime is 12031319. The next prime is 12031337. The reversal of 12031321 is 12313021.

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: 12313021 = 7 ⋅1759003.

It is a cyclic number.

It is not a de Polignac number, because 12031321 - 2¹ = 12031319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12031301) 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, 12415 + ... + 13348.

It is an arithmetic number, because the mean of its divisors is an integer number (3014388).

Almost surely, 2^12031321 is an apocalyptic number.

It is an amenable number.

12031321 is a deficient number, since it is larger than the sum of its proper divisors (26231).

12031321 is an equidigital number, since it uses as much as digits as its factorization.

12031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26230.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 12031321 is about 3468.6194660124. The cubic root of 12031321 is about 229.1418621013.

Adding to 12031321 its reverse (12313021), we get a palindrome (24344342).

The spelling of 12031321 in words is "twelve million, thirty-one thousand, three hundred twenty-one".