7130321 has 4 divisors (see below), whose sum is σ = 7778544. Its totient is φ = 6482100.

The previous prime is 7130267. The next prime is 7130329. The reversal of 7130321 is 1230317.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1230317 = 11 ⋅111847.

It is a cyclic number.

It is not a de Polignac number, because 7130321 - 2¹⁴ = 7113937 is a prime.

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 7130321.

It is not an unprimeable number, because it can be changed into a prime (7130329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324095 + ... + 324116.

It is an arithmetic number, because the mean of its divisors is an integer number (1944636).

Almost surely, 2^7130321 is an apocalyptic number.

It is an amenable number.

7130321 is a deficient number, since it is larger than the sum of its proper divisors (648223).

7130321 is a wasteful number, since it uses less digits than its factorization.

7130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648222.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 7130321 is about 2670.2660916096. The cubic root of 7130321 is about 192.4729461053.

Adding to 7130321 its reverse (1230317), we get a palindrome (8360638).

It can be divided in two parts, 7130 and 321, that multiplied together give a triangular number (2288730 = T₂₁₃₉).

The spelling of 7130321 in words is "seven million, one hundred thirty thousand, three hundred twenty-one".