2021111189 has 2 divisors, whose sum is σ = 2021111190. Its totient is φ = 2021111188.

The previous prime is 2021111167. The next prime is 2021111203. The reversal of 2021111189 is 9811111202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1861922500 + 159188689 = 43150^2 + 12617^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021111189 - 2⁸ = 2021110933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021111159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010555594 + 1010555595.

It is an arithmetic number, because the mean of its divisors is an integer number (1010555595).

Almost surely, 2^2021111189 is an apocalyptic number.

It is an amenable number.

2021111189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021111189 is an equidigital number, since it uses as much as digits as its factorization.

2021111189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 26.

The square root of 2021111189 is about 44956.7702242944. The cubic root of 2021111189 is about 1264.3386147241.

The spelling of 2021111189 in words is "two billion, twenty-one million, one hundred eleven thousand, one hundred eighty-nine".