198213799621 has 8 divisors (see below), whose sum is σ = 202833671040. Its totient is φ = 193594394112.

The previous prime is 198213799571. The next prime is 198213799627. The reversal of 198213799621 is 126997312891.

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 198213799621 - 2¹³ = 198213791429 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 (198213799627) 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, 833541 + ... + 1044613.

It is an arithmetic number, because the mean of its divisors is an integer number (25354208880).

Almost surely, 2^198213799621 is an apocalyptic number.

It is an amenable number.

198213799621 is a deficient number, since it is larger than the sum of its proper divisors (4619871419).

198213799621 is a wasteful number, since it uses less digits than its factorization.

198213799621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232955.

The product of its digits is 2939328, while the sum is 58.

The spelling of 198213799621 in words is "one hundred ninety-eight billion, two hundred thirteen million, seven hundred ninety-nine thousand, six hundred twenty-one".