198210421 has 8 divisors (see below), whose sum is σ = 203485824. Its totient is φ = 192979200.

The previous prime is 198210409. The next prime is 198210431. The reversal of 198210421 is 124012891.

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 198210421 - 2⁹ = 198209909 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 198210421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198210431) 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, 1855 + ... + 19996.

It is an arithmetic number, because the mean of its divisors is an integer number (25435728).

Almost surely, 2^198210421 is an apocalyptic number.

It is an amenable number.

198210421 is a deficient number, since it is larger than the sum of its proper divisors (5275403).

198210421 is a wasteful number, since it uses less digits than its factorization.

198210421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22091.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 198210421 is about 14078.7222786729. The cubic root of 198210421 is about 583.0540655796.

It can be divided in two parts, 1982 and 10421, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 198210421 in words is "one hundred ninety-eight million, two hundred ten thousand, four hundred twenty-one".