201221221189 has 2 divisors, whose sum is σ = 201221221190. Its totient is φ = 201221221188.

The previous prime is 201221221151. The next prime is 201221221211. The reversal of 201221221189 is 981122122102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162497672100 + 38723549089 = 403110^2 + 196783^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221221189 - 2⁹ = 201221220677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201221221189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221221129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610610594 + 100610610595.

It is an arithmetic number, because the mean of its divisors is an integer number (100610610595).

Almost surely, 2^201221221189 is an apocalyptic number.

It is an amenable number.

201221221189 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221221189 is an equidigital number, since it uses as much as digits as its factorization.

201221221189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 201221221189 in words is "two hundred one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred eighty-nine".