201221998163 has 2 divisors, whose sum is σ = 201221998164. Its totient is φ = 201221998162.

The previous prime is 201221997979. The next prime is 201221998247. The reversal of 201221998163 is 361899122102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201221998163 - 2¹² = 201221994067 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (201221998463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610999081 + 100610999082.

It is an arithmetic number, because the mean of its divisors is an integer number (100610999082).

Almost surely, 2^201221998163 is an apocalyptic number.

201221998163 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221998163 is an equidigital number, since it uses as much as digits as its factorization.

201221998163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 201221998163 in words is "two hundred one billion, two hundred twenty-one million, nine hundred ninety-eight thousand, one hundred sixty-three".