198812421 has 16 divisors (see below), whose sum is σ = 294995520. Its totient is φ = 132335280.

The previous prime is 198812413. The next prime is 198812423. The reversal of 198812421 is 124218891.

It is a happy number.

198812421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198812421 - 2³ = 198812413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198812423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13051 + ... + 23831.

It is an arithmetic number, because the mean of its divisors is an integer number (18437220).

Almost surely, 2^198812421 is an apocalyptic number.

It is an amenable number.

198812421 is a deficient number, since it is larger than the sum of its proper divisors (96183099).

198812421 is a wasteful number, since it uses less digits than its factorization.

198812421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11473 (or 11467 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 198812421 is about 14100.0858508025. The cubic root of 198812421 is about 583.6437483284.

The spelling of 198812421 in words is "one hundred ninety-eight million, eight hundred twelve thousand, four hundred twenty-one".