201221822393 has 2 divisors, whose sum is σ = 201221822394. Its totient is φ = 201221822392.

The previous prime is 201221822359. The next prime is 201221822411. The reversal of 201221822393 is 393228122102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153905566864 + 47316255529 = 392308^2 + 217523^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221822393 - 2¹⁰ = 201221821369 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (201221822293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610911196 + 100610911197.

It is an arithmetic number, because the mean of its divisors is an integer number (100610911197).

Almost surely, 2^201221822393 is an apocalyptic number.

It is an amenable number.

201221822393 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221822393 is an equidigital number, since it uses as much as digits as its factorization.

201221822393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

Adding to 201221822393 its reverse (393228122102), we get a palindrome (594449944495).

The spelling of 201221822393 in words is "two hundred one billion, two hundred twenty-one million, eight hundred twenty-two thousand, three hundred ninety-three".