198943221 has 8 divisors (see below), whose sum is σ = 269753760. Its totient is φ = 130380752.

The previous prime is 198943187. The next prime is 198943237. The reversal of 198943221 is 122349891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198943221 - 2¹¹ = 198941173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198943221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198943321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561810 + ... + 562163.

It is an arithmetic number, because the mean of its divisors is an integer number (33719220).

Almost surely, 2^198943221 is an apocalyptic number.

It is an amenable number.

198943221 is a deficient number, since it is larger than the sum of its proper divisors (70810539).

198943221 is a wasteful number, since it uses less digits than its factorization.

198943221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124035.

The product of its digits is 31104, while the sum is 39.

The square root of 198943221 is about 14104.7233577976. The cubic root of 198943221 is about 583.7717146234.

The spelling of 198943221 in words is "one hundred ninety-eight million, nine hundred forty-three thousand, two hundred twenty-one".