8120321 has 4 divisors (see below), whose sum is σ = 8858544. Its totient is φ = 7382100.

The previous prime is 8120317. The next prime is 8120363. The reversal of 8120321 is 1230218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8120321 - 2² = 8120317 is a prime.

It is a super-2 number, since 2×8120321² = 131879226286082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8120321.

It is not an unprimeable number, because it can be changed into a prime (8120921) 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 3 ways as a sum of consecutive naturals, for example, 369095 + ... + 369116.

It is an arithmetic number, because the mean of its divisors is an integer number (2214636).

Almost surely, 2^8120321 is an apocalyptic number.

It is an amenable number.

8120321 is a deficient number, since it is larger than the sum of its proper divisors (738223).

8120321 is a wasteful number, since it uses less digits than its factorization.

8120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738222.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 8120321 is about 2849.6176936565. The cubic root of 8120321 is about 200.9976897996.

Adding to 8120321 its reverse (1230218), we get a palindrome (9350539).

It can be divided in two parts, 81 and 20321, that added together give a palindrome (20402).

The spelling of 8120321 in words is "eight million, one hundred twenty thousand, three hundred twenty-one".