4003221 has 4 divisors (see below), whose sum is σ = 5337632. Its totient is φ = 2668812.

The previous prime is 4003213. The next prime is 4003231. The reversal of 4003221 is 1223004.

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 not a de Polignac number, because 4003221 - 2³ = 4003213 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

4003221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4003197 and 4003206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4003201) 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, 667201 + ... + 667206.

It is an arithmetic number, because the mean of its divisors is an integer number (1334408).

Almost surely, 2^4003221 is an apocalyptic number.

It is an amenable number.

4003221 is a deficient number, since it is larger than the sum of its proper divisors (1334411).

4003221 is a wasteful number, since it uses less digits than its factorization.

4003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334410.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 4003221 is about 2000.8050879583. The cubic root of 4003221 is about 158.7827022550.

Adding to 4003221 its reverse (1223004), we get a palindrome (5226225).

It can be divided in two parts, 4003 and 221, that added together give a palindrome (4224).

The spelling of 4003221 in words is "four million, three thousand, two hundred twenty-one".