12404200421 has 4 divisors (see below), whose sum is σ = 12831931500. Its totient is φ = 11976469344.

The previous prime is 12404200349. The next prime is 12404200423. The reversal of 12404200421 is 12400240421.

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 6611316100 + 5792884321 = 81310^2 + 76111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12404200421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12404200393 and 12404200402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12404200423) 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, 213865496 + ... + 213865553.

It is an arithmetic number, because the mean of its divisors is an integer number (3207982875).

Almost surely, 2^12404200421 is an apocalyptic number.

It is an amenable number.

12404200421 is a deficient number, since it is larger than the sum of its proper divisors (427731079).

12404200421 is an equidigital number, since it uses as much as digits as its factorization.

12404200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427731078.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 12404200421 its reverse (12400240421), we get a palindrome (24804440842).

The spelling of 12404200421 in words is "twelve billion, four hundred four million, two hundred thousand, four hundred twenty-one".