7071566221 has 2 divisors, whose sum is σ = 7071566222. Its totient is φ = 7071566220.

The previous prime is 7071566213. The next prime is 7071566233. The reversal of 7071566221 is 1226651707.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6302613321 + 768952900 = 79389^2 + 27730^2 .

It is an emirp because it is prime and its reverse (1226651707) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7071566221 - 2³ = 7071566213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7071566261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3535783110 + 3535783111.

It is an arithmetic number, because the mean of its divisors is an integer number (3535783111).

Almost surely, 2^7071566221 is an apocalyptic number.

It is an amenable number.

7071566221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7071566221 is an equidigital number, since it uses as much as digits as its factorization.

7071566221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 7071566221 is about 84092.6050315960. The cubic root of 7071566221 is about 1919.4281989581.

The spelling of 7071566221 in words is "seven billion, seventy-one million, five hundred sixty-six thousand, two hundred twenty-one".