8273221 has 4 divisors (see below), whose sum is σ = 9025344. Its totient is φ = 7521100.

The previous prime is 8273197. The next prime is 8273231. The reversal of 8273221 is 1223728.

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 8273221 - 2²¹ = 6176069 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 (8273231) 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, 376045 + ... + 376066.

It is an arithmetic number, because the mean of its divisors is an integer number (2256336).

Almost surely, 2^8273221 is an apocalyptic number.

It is an amenable number.

8273221 is a deficient number, since it is larger than the sum of its proper divisors (752123).

8273221 is a wasteful number, since it uses less digits than its factorization.

8273221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752122.

The product of its digits is 1344, while the sum is 25.

The square root of 8273221 is about 2876.3207401123. The cubic root of 8273221 is about 202.2514025011.

Adding to 8273221 its reverse (1223728), we get a palindrome (9496949).

The spelling of 8273221 in words is "eight million, two hundred seventy-three thousand, two hundred twenty-one".