7999902221 has 2 divisors, whose sum is σ = 7999902222. Its totient is φ = 7999902220.

The previous prime is 7999902181. The next prime is 7999902241. The reversal of 7999902221 is 1222099997.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7967526121 + 32376100 = 89261^2 + 5690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7999902221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7999902221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7999902241) 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, 3999951110 + 3999951111.

It is an arithmetic number, because the mean of its divisors is an integer number (3999951111).

Almost surely, 2^7999902221 is an apocalyptic number.

It is an amenable number.

7999902221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7999902221 is an equidigital number, since it uses as much as digits as its factorization.

7999902221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 50.

The square root of 7999902221 is about 89442.1724970945. The cubic root of 7999902221 is about 1999.9918517168.

The spelling of 7999902221 in words is "seven billion, nine hundred ninety-nine million, nine hundred two thousand, two hundred twenty-one".