84091321 has 8 divisors (see below), whose sum is σ = 89032320. Its totient is φ = 79201872.

The previous prime is 84091309. The next prime is 84091327. The reversal of 84091321 is 12319048.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84091321 - 2¹¹ = 84089273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84091321.

It is not an unprimeable number, because it can be changed into a prime (84091327) 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 7 ways as a sum of consecutive naturals, for example, 9505 + ... + 16078.

It is an arithmetic number, because the mean of its divisors is an integer number (11129040).

Almost surely, 2^84091321 is an apocalyptic number.

It is an amenable number.

84091321 is a deficient number, since it is larger than the sum of its proper divisors (4940999).

84091321 is a wasteful number, since it uses less digits than its factorization.

84091321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25775.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 84091321 is about 9170.1320055929. The cubic root of 84091321 is about 438.1105636800.

It can be divided in two parts, 8409 and 1321, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 84091321 in words is "eighty-four million, ninety-one thousand, three hundred twenty-one".