8320921 has 8 divisors (see below), whose sum is σ = 9535680. Its totient is φ = 7112688.

The previous prime is 8320919. The next prime is 8320943. The reversal of 8320921 is 1290238.

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 8320921 - 2¹ = 8320919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8300921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515 + ... + 4351.

It is an arithmetic number, because the mean of its divisors is an integer number (1191960).

Almost surely, 2^8320921 is an apocalyptic number.

It is an amenable number.

8320921 is a deficient number, since it is larger than the sum of its proper divisors (1214759).

8320921 is a wasteful number, since it uses less digits than its factorization.

8320921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 8320921 is about 2884.6006656035. The cubic root of 8320921 is about 202.6393574097.

The spelling of 8320921 in words is "eight million, three hundred twenty thousand, nine hundred twenty-one".