2021155189 has 2 divisors, whose sum is σ = 2021155190. Its totient is φ = 2021155188.

The previous prime is 2021155183. The next prime is 2021155193. The reversal of 2021155189 is 9815511202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1581414289 + 439740900 = 39767^2 + 20970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021155189 - 2¹⁹ = 2020630901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021155183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010577594 + 1010577595.

It is an arithmetic number, because the mean of its divisors is an integer number (1010577595).

Almost surely, 2^2021155189 is an apocalyptic number.

It is an amenable number.

2021155189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021155189 is an equidigital number, since it uses as much as digits as its factorization.

2021155189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 34.

The square root of 2021155189 is about 44957.2595806284. The cubic root of 2021155189 is about 1264.3477896268.

The spelling of 2021155189 in words is "two billion, twenty-one million, one hundred fifty-five thousand, one hundred eighty-nine".