198315246221 has 2 divisors, whose sum is σ = 198315246222. Its totient is φ = 198315246220.

The previous prime is 198315246197. The next prime is 198315246289. The reversal of 198315246221 is 122642513891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175699297225 + 22615948996 = 419165^2 + 150386^2 .

It is a cyclic number.

It is not a de Polignac number, because 198315246221 - 2¹⁴ = 198315229837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198315246421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99157623110 + 99157623111.

It is an arithmetic number, because the mean of its divisors is an integer number (99157623111).

Almost surely, 2^198315246221 is an apocalyptic number.

It is an amenable number.

198315246221 is a deficient number, since it is larger than the sum of its proper divisors (1).

198315246221 is an equidigital number, since it uses as much as digits as its factorization.

198315246221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 44.

The spelling of 198315246221 in words is "one hundred ninety-eight billion, three hundred fifteen million, two hundred forty-six thousand, two hundred twenty-one".