4201221 has 8 divisors (see below), whose sum is σ = 5629024. Its totient is φ = 2787120.

The previous prime is 4201217. The next prime is 4201243. The reversal of 4201221 is 1221024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4201221 - 2² = 4201217 is a prime.

It is a Duffinian number.

4201221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4201197 and 4201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4201271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2686 + ... + 3951.

It is an arithmetic number, because the mean of its divisors is an integer number (703628).

Almost surely, 2^4201221 is an apocalyptic number.

It is an amenable number.

4201221 is a deficient number, since it is larger than the sum of its proper divisors (1427803).

4201221 is a wasteful number, since it uses less digits than its factorization.

4201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6851.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 4201221 is about 2049.6880250419. The cubic root of 4201221 is about 161.3584979795.

Adding to 4201221 its reverse (1221024), we get a palindrome (5422245).

The spelling of 4201221 in words is "four million, two hundred one thousand, two hundred twenty-one".