198135176221 has 8 divisors (see below), whose sum is σ = 198664498944. Its totient is φ = 197606561040.

The previous prime is 198135176149. The next prime is 198135176237. The reversal of 198135176221 is 122671531891.

198135176221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 198135176221 - 2³³ = 189545241629 is a prime.

It is a super-3 number, since 3×198135176221³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198135176821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386316 + ... + 738586.

It is an arithmetic number, because the mean of its divisors is an integer number (24833062368).

Almost surely, 2^198135176221 is an apocalyptic number.

It is an amenable number.

198135176221 is a deficient number, since it is larger than the sum of its proper divisors (529322723).

198135176221 is an equidigital number, since it uses as much as digits as its factorization.

198135176221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353771.

The product of its digits is 181440, while the sum is 46.

The spelling of 198135176221 in words is "one hundred ninety-eight billion, one hundred thirty-five million, one hundred seventy-six thousand, two hundred twenty-one".