12432040221 has 4 divisors (see below), whose sum is σ = 16576053632. Its totient is φ = 8288026812.

The previous prime is 12432040217. The next prime is 12432040249. The reversal of 12432040221 is 12204023421.

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 not a de Polignac number, because 12432040221 - 2² = 12432040217 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 (12432040261) 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, 2072006701 + ... + 2072006706.

It is an arithmetic number, because the mean of its divisors is an integer number (4144013408).

Almost surely, 2^12432040221 is an apocalyptic number.

It is an amenable number.

12432040221 is a deficient number, since it is larger than the sum of its proper divisors (4144013411).

12432040221 is an equidigital number, since it uses as much as digits as its factorization.

12432040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144013410.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 12432040221 its reverse (12204023421), we get a palindrome (24636063642).

The spelling of 12432040221 in words is "twelve billion, four hundred thirty-two million, forty thousand, two hundred twenty-one".