6704531221 has 2 divisors, whose sum is σ = 6704531222. Its totient is φ = 6704531220.

The previous prime is 6704531201. The next prime is 6704531237. The reversal of 6704531221 is 1221354076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4673226321 + 2031304900 = 68361^2 + 45070^2 .

It is a cyclic number.

It is not a de Polignac number, because 6704531221 - 2¹⁷ = 6704400149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6704531201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3352265610 + 3352265611.

It is an arithmetic number, because the mean of its divisors is an integer number (3352265611).

Almost surely, 2^6704531221 is an apocalyptic number.

It is an amenable number.

6704531221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6704531221 is an equidigital number, since it uses as much as digits as its factorization.

6704531221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 6704531221 is about 81881.2018780868. The cubic root of 6704531221 is about 1885.6285240204.

Adding to 6704531221 its reverse (1221354076), we get a palindrome (7925885297).

The spelling of 6704531221 in words is "six billion, seven hundred four million, five hundred thirty-one thousand, two hundred twenty-one".