198170421 has 8 divisors (see below), whose sum is σ = 264359424. Its totient is φ = 132047520.

The previous prime is 198170407. The next prime is 198170429. The reversal of 198170421 is 124071891.

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

It is not a de Polignac number, because 198170421 - 2⁷ = 198170293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198170429) 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, 9045 + ... + 21866.

It is an arithmetic number, because the mean of its divisors is an integer number (33044928).

Almost surely, 2^198170421 is an apocalyptic number.

It is an amenable number.

198170421 is a deficient number, since it is larger than the sum of its proper divisors (66189003).

198170421 is a wasteful number, since it uses less digits than its factorization.

198170421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33051.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 198170421 is about 14077.3016235357. The cubic root of 198170421 is about 583.0148417226.

The spelling of 198170421 in words is "one hundred ninety-eight million, one hundred seventy thousand, four hundred twenty-one".