84221329 has 2 divisors, whose sum is σ = 84221330. Its totient is φ = 84221328.

The previous prime is 84221311. The next prime is 84221387. The reversal of 84221329 is 92312248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66455104 + 17766225 = 8152^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 84221329 - 2¹⁹ = 83697041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84221329.

It is not a weakly prime, because it can be changed into another prime (84221429) 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 as a sum of consecutive naturals, namely, 42110664 + 42110665.

It is an arithmetic number, because the mean of its divisors is an integer number (42110665).

Almost surely, 2^84221329 is an apocalyptic number.

It is an amenable number.

84221329 is a deficient number, since it is larger than the sum of its proper divisors (1).

84221329 is an equidigital number, since it uses as much as digits as its factorization.

84221329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 84221329 is about 9177.2179335570. The cubic root of 84221329 is about 438.3362252970.

The spelling of 84221329 in words is "eighty-four million, two hundred twenty-one thousand, three hundred twenty-nine".