12443021 has 4 divisors (see below), whose sum is σ = 12460512. Its totient is φ = 12425532.

The previous prime is 12442999. The next prime is 12443029. The reversal of 12443021 is 12034421.

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: 12034421 = 7 ⋅1719203.

It is a cyclic number.

It is not a de Polignac number, because 12443021 - 2⁶ = 12442957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12443029) 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, 7631 + ... + 9116.

It is an arithmetic number, because the mean of its divisors is an integer number (3115128).

Almost surely, 2^12443021 is an apocalyptic number.

It is an amenable number.

12443021 is a deficient number, since it is larger than the sum of its proper divisors (17491).

12443021 is an equidigital number, since it uses as much as digits as its factorization.

12443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17490.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12443021 is about 3527.4666546971. The cubic root of 12443021 is about 231.7262737314.

Adding to 12443021 its reverse (12034421), we get a palindrome (24477442).

The spelling of 12443021 in words is "twelve million, four hundred forty-three thousand, twenty-one".