4421221 has 12 divisors (see below), whose sum is σ = 5368032. Its totient is φ = 3623928.

The previous prime is 4421213. The next prime is 4421227. The reversal of 4421221 is 1221244.

4421221 is digitally balanced in base 8, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4421221 - 2³ = 4421213 is a prime.

It is a Duffinian number.

4421221 is strictly pandigital in base 8.

4421221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4421195 and 4421204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4421227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 835 + ... + 3088.

It is an arithmetic number, because the mean of its divisors is an integer number (447336).

Almost surely, 2^4421221 is an apocalyptic number.

It is an amenable number.

4421221 is a deficient number, since it is larger than the sum of its proper divisors (946811).

4421221 is a wasteful number, since it uses less digits than its factorization.

4421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960 (or 3953 counting only the distinct ones).

The product of its digits is 128, while the sum is 16.

The square root of 4421221 is about 2102.6699693485. The cubic root of 4421221 is about 164.1272683534.

Adding to 4421221 its reverse (1221244), we get a palindrome (5642465).

The spelling of 4421221 in words is "four million, four hundred twenty-one thousand, two hundred twenty-one".