7313821 has 4 divisors (see below), whose sum is σ = 7328700. Its totient is φ = 7298944.

The previous prime is 7313819. The next prime is 7313833. The reversal of 7313821 is 1283137.

7313821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5225796 + 2088025 = 2286^2 + 1445^2 .

It is a cyclic number.

It is not a de Polignac number, because 7313821 - 2¹ = 7313819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7313881) 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, 6676 + ... + 7693.

It is an arithmetic number, because the mean of its divisors is an integer number (1832175).

Almost surely, 2^7313821 is an apocalyptic number.

It is an amenable number.

7313821 is a deficient number, since it is larger than the sum of its proper divisors (14879).

7313821 is a wasteful number, since it uses less digits than its factorization.

7313821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14878.

The product of its digits is 1008, while the sum is 25.

The square root of 7313821 is about 2704.4076985543. The cubic root of 7313821 is about 194.1100891438.

Adding to 7313821 its reverse (1283137), we get a palindrome (8596958).

The spelling of 7313821 in words is "seven million, three hundred thirteen thousand, eight hundred twenty-one".