4042221 has 8 divisors (see below), whose sum is σ = 5426400. Its totient is φ = 2676432.

The previous prime is 4042217. The next prime is 4042249. The reversal of 4042221 is 1222404.

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

It is not a de Polignac number, because 4042221 - 2² = 4042217 is a prime.

It is a super-2 number, since 2×4042221² = 32679101225682, which contains 22 as substring.

It is an Ulam number.

4042221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4042221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4075 + ... + 4968.

It is an arithmetic number, because the mean of its divisors is an integer number (678300).

Almost surely, 2^4042221 is an apocalyptic number.

It is an amenable number.

4042221 is a deficient number, since it is larger than the sum of its proper divisors (1384179).

4042221 is a wasteful number, since it uses less digits than its factorization.

4042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9195.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 4042221 is about 2010.5275427111. The cubic root of 4042221 is about 159.2966653871.

Adding to 4042221 its reverse (1222404), we get a palindrome (5264625).

The spelling of 4042221 in words is "four million, forty-two thousand, two hundred twenty-one".