457221 has 4 divisors (see below), whose sum is σ = 609632. Its totient is φ = 304812.

The previous prime is 457213. The next prime is 457229. The reversal of 457221 is 122754.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (457213) and next prime (457229).

It is not a de Polignac number, because 457221 - 2³ = 457213 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 457221.

It is not an unprimeable number, because it can be changed into a prime (457229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76201 + ... + 76206.

It is an arithmetic number, because the mean of its divisors is an integer number (152408).

2⁴⁵⁷²²¹ is an apocalyptic number.

It is an amenable number.

457221 is a deficient number, since it is larger than the sum of its proper divisors (152411).

457221 is a wasteful number, since it uses less digits than its factorization.

457221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152410.

The product of its digits is 560, while the sum is 21.

The square root of 457221 is about 676.1811887357. The cubic root of 457221 is about 77.0386605207.

Adding to 457221 its reverse (122754), we get a palindrome (579975).

The spelling of 457221 in words is "four hundred fifty-seven thousand, two hundred twenty-one".