199248221 has 2 divisors, whose sum is σ = 199248222. Its totient is φ = 199248220.

The previous prime is 199248199. The next prime is 199248227. The reversal of 199248221 is 122842991.

199248221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174108025 + 25140196 = 13195^2 + 5014^2 .

It is an emirp because it is prime and its reverse (122842991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199248221 - 2⁶ = 199248157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199248227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99624110 + 99624111.

It is an arithmetic number, because the mean of its divisors is an integer number (99624111).

Almost surely, 2^199248221 is an apocalyptic number.

It is an amenable number.

199248221 is a deficient number, since it is larger than the sum of its proper divisors (1).

199248221 is an equidigital number, since it uses as much as digits as its factorization.

199248221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 199248221 is about 14115.5311979394. The cubic root of 199248221 is about 584.0698892479.

The spelling of 199248221 in words is "one hundred ninety-nine million, two hundred forty-eight thousand, two hundred twenty-one".