4291221 has 16 divisors (see below), whose sum is σ = 6304320. Its totient is φ = 2574720.

The previous prime is 4291219. The next prime is 4291249. The reversal of 4291221 is 1221924.

It is not a de Polignac number, because 4291221 - 2¹ = 4291219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4291211) 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 15 ways as a sum of consecutive naturals, for example, 3001 + ... + 4193.

It is an arithmetic number, because the mean of its divisors is an integer number (394020).

Almost surely, 2^4291221 is an apocalyptic number.

It is an amenable number.

4291221 is a deficient number, since it is larger than the sum of its proper divisors (2013099).

4291221 is a wasteful number, since it uses less digits than its factorization.

4291221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316.

The product of its digits is 288, while the sum is 21.

The square root of 4291221 is about 2071.5262489286. The cubic root of 4291221 is about 162.5025924636.

The spelling of 4291221 in words is "four million, two hundred ninety-one thousand, two hundred twenty-one".