7221313 has 4 divisors (see below), whose sum is σ = 7877808. Its totient is φ = 6564820.

The previous prime is 7221307. The next prime is 7221353. The reversal of 7221313 is 3131227.

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: 3131227 = 11 ⋅284657.

It is a cyclic number.

It is not a de Polignac number, because 7221313 - 2⁵ = 7221281 is a prime.

It is a super-3 number, since 3×7221313³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7221353) 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, 328231 + ... + 328252.

It is an arithmetic number, because the mean of its divisors is an integer number (1969452).

Almost surely, 2^7221313 is an apocalyptic number.

It is an amenable number.

7221313 is a deficient number, since it is larger than the sum of its proper divisors (656495).

7221313 is a wasteful number, since it uses less digits than its factorization.

7221313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656494.

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

The square root of 7221313 is about 2687.2500814029. The cubic root of 7221313 is about 193.2882214074.

The spelling of 7221313 in words is "seven million, two hundred twenty-one thousand, three hundred thirteen".