199256221 has 2 divisors, whose sum is σ = 199256222. Its totient is φ = 199256220.

The previous prime is 199256209. The next prime is 199256243. The reversal of 199256221 is 122652991.

199256221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192127321 + 7128900 = 13861^2 + 2670^2 .

It is an emirp because it is prime and its reverse (122652991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199256221 - 2¹¹ = 199254173 is a prime.

It is a Chen prime.

It is equal to p_11039968 and since 199256221 and 11039968 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199256261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99628110 + 99628111.

It is an arithmetic number, because the mean of its divisors is an integer number (99628111).

Almost surely, 2^199256221 is an apocalyptic number.

It is an amenable number.

199256221 is a deficient number, since it is larger than the sum of its proper divisors (1).

199256221 is an equidigital number, since it uses as much as digits as its factorization.

199256221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 199256221 is about 14115.8145708988. The cubic root of 199256221 is about 584.0777061250.

The spelling of 199256221 in words is "one hundred ninety-nine million, two hundred fifty-six thousand, two hundred twenty-one".