4664221 has 2 divisors, whose sum is σ = 4664222. Its totient is φ = 4664220.

The previous prime is 4664213. The next prime is 4664227. The reversal of 4664221 is 1224664.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2604996 + 2059225 = 1614^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 4664221 - 2³ = 4664213 is a prime.

4664221 is a lucky number.

It is equal to p₃₂₆₆₀₈ and since 4664221 and 326608 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4664227) by changing a digit.

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 as a sum of consecutive naturals, namely, 2332110 + 2332111.

It is an arithmetic number, because the mean of its divisors is an integer number (2332111).

Almost surely, 2^4664221 is an apocalyptic number.

It is an amenable number.

4664221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4664221 is an equidigital number, since it uses as much as digits as its factorization.

4664221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 25.

The square root of 4664221 is about 2159.6807634463. The cubic root of 4664221 is about 167.0807335509.

Adding to 4664221 its reverse (1224664), we get a palindrome (5888885).

It can be divided in two parts, 4 and 664221, that added together give a square (664225 = 815²).

The spelling of 4664221 in words is "four million, six hundred sixty-four thousand, two hundred twenty-one".