7223208221 has 2 divisors, whose sum is σ = 7223208222. Its totient is φ = 7223208220.

The previous prime is 7223208203. The next prime is 7223208247. The reversal of 7223208221 is 1228023227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3783972196 + 3439236025 = 61514^2 + 58645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7223208221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7223208821) 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 as a sum of consecutive naturals, namely, 3611604110 + 3611604111.

It is an arithmetic number, because the mean of its divisors is an integer number (3611604111).

Almost surely, 2^7223208221 is an apocalyptic number.

It is an amenable number.

7223208221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7223208221 is an equidigital number, since it uses as much as digits as its factorization.

7223208221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 7223208221 is about 84989.4594699837. The cubic root of 7223208221 is about 1933.0512931384.

The spelling of 7223208221 in words is "seven billion, two hundred twenty-three million, two hundred eight thousand, two hundred twenty-one".