4242221 has 4 divisors (see below), whose sum is σ = 4296000. Its totient is φ = 4188444.

The previous prime is 4242211. The next prime is 4242223. The reversal of 4242221 is 1222424.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 4242221 - 2²² = 47917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4242221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4242223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26771 + ... + 26928.

It is an arithmetic number, because the mean of its divisors is an integer number (1074000).

Almost surely, 2^4242221 is an apocalyptic number.

It is an amenable number.

4242221 is a deficient number, since it is larger than the sum of its proper divisors (53779).

4242221 is an equidigital number, since it uses as much as digits as its factorization.

4242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53778.

The product of its digits is 256, while the sum is 17.

The square root of 4242221 is about 2059.6652640660. The cubic root of 4242221 is about 161.8817024898.

Adding to 4242221 its reverse (1222424), we get a palindrome (5464645).

The spelling of 4242221 in words is "four million, two hundred forty-two thousand, two hundred twenty-one".