201121220189 has 2 divisors, whose sum is σ = 201121220190. Its totient is φ = 201121220188.

The previous prime is 201121220129. The next prime is 201121220213. The reversal of 201121220189 is 981022121102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178534136089 + 22587084100 = 422533^2 + 150290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201121220189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201121220129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560610094 + 100560610095.

It is an arithmetic number, because the mean of its divisors is an integer number (100560610095).

Almost surely, 2^201121220189 is an apocalyptic number.

It is an amenable number.

201121220189 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121220189 is an equidigital number, since it uses as much as digits as its factorization.

201121220189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 201121220189 in words is "two hundred one billion, one hundred twenty-one million, two hundred twenty thousand, one hundred eighty-nine".