4004242221 has 24 divisors (see below), whose sum is σ = 6342814080. Its totient is φ = 2239450752.

The previous prime is 4004242211. The next prime is 4004242261. The reversal of 4004242221 is 1222424004.

It is not a de Polignac number, because 4004242221 - 2¹⁸ = 4003980077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4004242211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 282876 + ... + 296693.

It is an arithmetic number, because the mean of its divisors is an integer number (264283920).

Almost surely, 2^4004242221 is an apocalyptic number.

It is an amenable number.

4004242221 is a deficient number, since it is larger than the sum of its proper divisors (2338571859).

4004242221 is a wasteful number, since it uses less digits than its factorization.

4004242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579633 (or 579626 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 4004242221 is about 63279.0820176778. The cubic root of 4004242221 is about 1587.9620292056.

Adding to 4004242221 its reverse (1222424004), we get a palindrome (5226666225).

The spelling of 4004242221 in words is "four billion, four million, two hundred forty-two thousand, two hundred twenty-one".