12042432321 has 4 divisors (see below), whose sum is σ = 16056576432. Its totient is φ = 8028288212.

The previous prime is 12042432277. The next prime is 12042432343. The reversal of 12042432321 is 12323424021.

It is a happy number.

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: 12323424021 = 3 ⋅4107808007.

It is a cyclic number.

It is not a de Polignac number, because 12042432321 - 2¹¹ = 12042430273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12042432291 and 12042432300.

It is not an unprimeable number, because it can be changed into a prime (12042432361) 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, 2007072051 + ... + 2007072056.

It is an arithmetic number, because the mean of its divisors is an integer number (4014144108).

Almost surely, 2^12042432321 is an apocalyptic number.

It is an amenable number.

12042432321 is a deficient number, since it is larger than the sum of its proper divisors (4014144111).

12042432321 is an equidigital number, since it uses as much as digits as its factorization.

12042432321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014144110.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 12042432321 its reverse (12323424021), we get a palindrome (24365856342).

The spelling of 12042432321 in words is "twelve billion, forty-two million, four hundred thirty-two thousand, three hundred twenty-one".