4003424021 has 4 divisors (see below), whose sum is σ = 4014895500. Its totient is φ = 3991952544.

The previous prime is 4003424017. The next prime is 4003424069. The reversal of 4003424021 is 1204243004.

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 3353683921 + 649740100 = 57911^2 + 25490^2 .

It is a cyclic number.

It is not a de Polignac number, because 4003424021 - 2² = 4003424017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4003423984 and 4003424002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4003424071) 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, 5735216 + ... + 5735913.

It is an arithmetic number, because the mean of its divisors is an integer number (1003723875).

Almost surely, 2^4003424021 is an apocalyptic number.

It is an amenable number.

4003424021 is a deficient number, since it is larger than the sum of its proper divisors (11471479).

4003424021 is a wasteful number, since it uses less digits than its factorization.

4003424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11471478.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 4003424021 is about 63272.6166757785. The cubic root of 4003424021 is about 1587.8538640011.

Adding to 4003424021 its reverse (1204243004), we get a palindrome (5207667025).

The spelling of 4003424021 in words is "four billion, three million, four hundred twenty-four thousand, twenty-one".