8436221 has 4 divisors (see below), whose sum is σ = 8531100. Its totient is φ = 8341344.

The previous prime is 8436217. The next prime is 8436271. The reversal of 8436221 is 1226348.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4972900 + 3463321 = 2230^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 8436221 - 2² = 8436217 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 (8436271) 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 in 3 ways as a sum of consecutive naturals, for example, 47306 + ... + 47483.

It is an arithmetic number, because the mean of its divisors is an integer number (2132775).

Almost surely, 2^8436221 is an apocalyptic number.

It is an amenable number.

8436221 is a deficient number, since it is larger than the sum of its proper divisors (94879).

8436221 is an equidigital number, since it uses as much as digits as its factorization.

8436221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94878.

The product of its digits is 2304, while the sum is 26.

The square root of 8436221 is about 2904.5173437251. The cubic root of 8436221 is about 203.5710340874.

The spelling of 8436221 in words is "eight million, four hundred thirty-six thousand, two hundred twenty-one".