7321213 has 4 divisors (see below), whose sum is σ = 7706560. Its totient is φ = 6935868.

The previous prime is 7321207. The next prime is 7321217. The reversal of 7321213 is 3121237.

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: 3121237 = 7 ⋅445891.

It is a cyclic number.

It is not a de Polignac number, because 7321213 - 2⁹ = 7320701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 385327 = 7321213 / (7 + 3 + 2 + 1 + 2 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7321217) 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 3 ways as a sum of consecutive naturals, for example, 192645 + ... + 192682.

It is an arithmetic number, because the mean of its divisors is an integer number (1926640).

Almost surely, 2^7321213 is an apocalyptic number.

It is an amenable number.

7321213 is a deficient number, since it is larger than the sum of its proper divisors (385347).

7321213 is a wasteful number, since it uses less digits than its factorization.

7321213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385346.

The product of its digits is 252, while the sum is 19.

The square root of 7321213 is about 2705.7740112581. The cubic root of 7321213 is about 194.1754621160.

The spelling of 7321213 in words is "seven million, three hundred twenty-one thousand, two hundred thirteen".