4857221 has 2 divisors, whose sum is σ = 4857222. Its totient is φ = 4857220.

The previous prime is 4857211. The next prime is 4857227. The reversal of 4857221 is 1227584.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4056196 + 801025 = 2014^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 4857221 - 2¹⁸ = 4595077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4857227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2428610 + 2428611.

It is an arithmetic number, because the mean of its divisors is an integer number (2428611).

Almost surely, 2^4857221 is an apocalyptic number.

It is an amenable number.

4857221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4857221 is an equidigital number, since it uses as much as digits as its factorization.

4857221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 29.

The square root of 4857221 is about 2203.9103883779. The cubic root of 4857221 is about 169.3541933747.

The spelling of 4857221 in words is "four million, eight hundred fifty-seven thousand, two hundred twenty-one".