199249221 has 4 divisors (see below), whose sum is σ = 265665632. Its totient is φ = 132832812.

The previous prime is 199249189. The next prime is 199249243. The reversal of 199249221 is 122942991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 199249221 - 2⁵ = 199249189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199249221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199249261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33208201 + ... + 33208206.

It is an arithmetic number, because the mean of its divisors is an integer number (66416408).

Almost surely, 2^199249221 is an apocalyptic number.

It is an amenable number.

199249221 is a deficient number, since it is larger than the sum of its proper divisors (66416411).

199249221 is an equidigital number, since it uses as much as digits as its factorization.

199249221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66416410.

The product of its digits is 23328, while the sum is 39.

The square root of 199249221 is about 14115.5666198704. The cubic root of 199249221 is about 584.0708663690.

The spelling of 199249221 in words is "one hundred ninety-nine million, two hundred forty-nine thousand, two hundred twenty-one".