4004243421 has 4 divisors (see below), whose sum is σ = 5338991232. Its totient is φ = 2669495612.

The previous prime is 4004243413. The next prime is 4004243437. The reversal of 4004243421 is 1243424004.

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.

It is a cyclic number.

It is not a de Polignac number, because 4004243421 - 2³ = 4004243413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4004243391 and 4004243400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4004243471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 667373901 + ... + 667373906.

It is an arithmetic number, because the mean of its divisors is an integer number (1334747808).

Almost surely, 2^4004243421 is an apocalyptic number.

It is an amenable number.

4004243421 is a deficient number, since it is larger than the sum of its proper divisors (1334747811).

4004243421 is a wasteful number, since it uses less digits than its factorization.

4004243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334747810.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 4004243421 is about 63279.0914994835. The cubic root of 4004243421 is about 1587.9621878336.

Adding to 4004243421 its reverse (1243424004), we get a palindrome (5247667425).

The spelling of 4004243421 in words is "four billion, four million, two hundred forty-three thousand, four hundred twenty-one".