6713221 has 2 divisors, whose sum is σ = 6713222. Its totient is φ = 6713220.

The previous prime is 6713219. The next prime is 6713257. The reversal of 6713221 is 1223176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6477025 + 236196 = 2545^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 6713221 - 2¹ = 6713219 is a prime.

Together with 6713219, it forms a pair of twin primes.

6713221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6713192 and 6713201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6713261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3356610 + 3356611.

It is an arithmetic number, because the mean of its divisors is an integer number (3356611).

Almost surely, 2^6713221 is an apocalyptic number.

It is an amenable number.

6713221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6713221 is an equidigital number, since it uses as much as digits as its factorization.

6713221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 22.

The square root of 6713221 is about 2590.9884214330. The cubic root of 6713221 is about 188.6442830072.

Adding to 6713221 its reverse (1223176), we get a palindrome (7936397).

The spelling of 6713221 in words is "six million, seven hundred thirteen thousand, two hundred twenty-one".