198358007621 has 4 divisors (see below), whose sum is σ = 203719034892. Its totient is φ = 192996980352.

The previous prime is 198358007609. The next prime is 198358007713. The reversal of 198358007621 is 126700853891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127671150721 + 70686856900 = 357311^2 + 265870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198358007621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 198358007621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198358057621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2680513580 + ... + 2680513653.

It is an arithmetic number, because the mean of its divisors is an integer number (50929758723).

Almost surely, 2^198358007621 is an apocalyptic number.

It is an amenable number.

198358007621 is a deficient number, since it is larger than the sum of its proper divisors (5361027271).

198358007621 is an equidigital number, since it uses as much as digits as its factorization.

198358007621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361027270.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 198358007621 in words is "one hundred ninety-eight billion, three hundred fifty-eight million, seven thousand, six hundred twenty-one".