198102221 has 8 divisors (see below), whose sum is σ = 200256504. Its totient is φ = 195955200.

The previous prime is 198102211. The next prime is 198102239. The reversal of 198102221 is 122201891.

It can be written as a sum of positive squares in 4 ways, for example, as 68392900 + 129709321 = 8270^2 + 11389^2 .

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 198102221 - 2¹⁸ = 197840077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198102211) 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 in 7 ways as a sum of consecutive naturals, for example, 66455 + ... + 69371.

It is an arithmetic number, because the mean of its divisors is an integer number (25032063).

Almost surely, 2^198102221 is an apocalyptic number.

It is an amenable number.

198102221 is a deficient number, since it is larger than the sum of its proper divisors (2154283).

198102221 is a wasteful number, since it uses less digits than its factorization.

198102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 198102221 is about 14074.8790758571. The cubic root of 198102221 is about 582.9479528731.

The spelling of 198102221 in words is "one hundred ninety-eight million, one hundred two thousand, two hundred twenty-one".