8453221 has 4 divisors (see below), whose sum is σ = 9660832. Its totient is φ = 7245612.

The previous prime is 8453219. The next prime is 8453227. The reversal of 8453221 is 1223548.

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 a cyclic number.

It is not a de Polignac number, because 8453221 - 2¹ = 8453219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8453227) 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 3 ways as a sum of consecutive naturals, for example, 603795 + ... + 603808.

It is an arithmetic number, because the mean of its divisors is an integer number (2415208).

Almost surely, 2^8453221 is an apocalyptic number.

It is an amenable number.

8453221 is a deficient number, since it is larger than the sum of its proper divisors (1207611).

8453221 is a wasteful number, since it uses less digits than its factorization.

8453221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207610.

The product of its digits is 1920, while the sum is 25.

The square root of 8453221 is about 2907.4423468059. The cubic root of 8453221 is about 203.7076823804.

Adding to 8453221 its reverse (1223548), we get a palindrome (9676769).

The spelling of 8453221 in words is "eight million, four hundred fifty-three thousand, two hundred twenty-one".