121111202020189 has 2 divisors, whose sum is σ = 121111202020190. Its totient is φ = 121111202020188.

The previous prime is 121111202020103. The next prime is 121111202020223. The reversal of 121111202020189 is 981020202111121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60788920725625 + 60322281294564 = 7796725^2 + 7766742^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111202020189 - 2³⁵ = 121076842281821 is a prime.

It is a super-2 number, since 2×121111202020189² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121111202020189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111202020489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555601010094 + 60555601010095.

It is an arithmetic number, because the mean of its divisors is an integer number (60555601010095).

Almost surely, 2^{121111202020189} is an apocalyptic number.

It is an amenable number.

121111202020189 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111202020189 is an equidigital number, since it uses as much as digits as its factorization.

121111202020189 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 31.

The spelling of 121111202020189 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred two million, twenty thousand, one hundred eighty-nine".