84443221 has 2 divisors, whose sum is σ = 84443222. Its totient is φ = 84443220.

The previous prime is 84443207. The next prime is 84443243. The reversal of 84443221 is 12234448.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79014321 + 5428900 = 8889^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 84443221 - 2¹¹ = 84441173 is a prime.

It is equal to p_4913272 and since 84443221 and 4913272 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 84443221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84440221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42221610 + 42221611.

It is an arithmetic number, because the mean of its divisors is an integer number (42221611).

Almost surely, 2^84443221 is an apocalyptic number.

It is an amenable number.

84443221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84443221 is an equidigital number, since it uses as much as digits as its factorization.

84443221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 28.

The square root of 84443221 is about 9189.2992659941. The cubic root of 84443221 is about 438.7208389100.

Adding to 84443221 its reverse (12234448), we get a palindrome (96677669).

The spelling of 84443221 in words is "eighty-four million, four hundred forty-three thousand, two hundred twenty-one".