4820221 has 16 divisors (see below), whose sum is σ = 5770240. Its totient is φ = 3939840.

The previous prime is 4820219. The next prime is 4820227. The reversal of 4820221 is 1220284.

It is a cyclic number.

It is not a de Polignac number, because 4820221 - 2¹ = 4820219 is a prime.

It is the 2196-th Hogben number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4820227) by changing a digit.

It is a nontrivial repunit in base 2195.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20935 + ... + 21163.

It is an arithmetic number, because the mean of its divisors is an integer number (360640).

Almost surely, 2^4820221 is an apocalyptic number.

It is an amenable number.

4820221 is a deficient number, since it is larger than the sum of its proper divisors (950019).

4820221 is a wasteful number, since it uses less digits than its factorization.

4820221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 4820221 is about 2195.5001708039. The cubic root of 4820221 is about 168.9230769284.

It can be divided in two parts, 4820 and 221, that added together give a square (5041 = 71²).

The spelling of 4820221 in words is "four million, eight hundred twenty thousand, two hundred twenty-one".