12331021 has 4 divisors (see below), whose sum is σ = 12354112. Its totient is φ = 12307932.

The previous prime is 12330991. The next prime is 12331049. The reversal of 12331021 is 12013321.

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.

It is a cyclic number.

It is not a de Polignac number, because 12331021 - 2⁷ = 12330893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12330992 and 12331010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12331621) 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, 10725 + ... + 11818.

It is an arithmetic number, because the mean of its divisors is an integer number (3088528).

Almost surely, 2^12331021 is an apocalyptic number.

It is an amenable number.

12331021 is a deficient number, since it is larger than the sum of its proper divisors (23091).

12331021 is an equidigital number, since it uses as much as digits as its factorization.

12331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23090.

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

The square root of 12331021 is about 3511.5553534011. Note that the first 3 decimals coincide. The cubic root of 12331021 is about 231.0289188760.

Adding to 12331021 its reverse (12013321), we get a palindrome (24344342).

The spelling of 12331021 in words is "twelve million, three hundred thirty-one thousand, twenty-one".