12431803421 has 4 divisors (see below), whose sum is σ = 12602102172. Its totient is φ = 12261504672.

The previous prime is 12431803399. The next prime is 12431803451. The reversal of 12431803421 is 12430813421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3491155396 + 8940648025 = 59086^2 + 94555^2 .

It is a cyclic number.

It is not a de Polignac number, because 12431803421 - 2⁶ = 12431803357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12431803451) 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, 85149266 + ... + 85149411.

It is an arithmetic number, because the mean of its divisors is an integer number (3150525543).

Almost surely, 2^12431803421 is an apocalyptic number.

It is an amenable number.

12431803421 is a deficient number, since it is larger than the sum of its proper divisors (170298751).

12431803421 is an equidigital number, since it uses as much as digits as its factorization.

12431803421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170298750.

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 12431803421 in words is "twelve billion, four hundred thirty-one million, eight hundred three thousand, four hundred twenty-one".