2018021 has 2 divisors, whose sum is σ = 2018022. Its totient is φ = 2018020.

The previous prime is 2017991. The next prime is 2018041. The reversal of 2018021 is 1208102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 829921 = 1090^2 + 911^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018021 - 2⁶ = 2017957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2017987 and 2018005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2018041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009010 + 1009011.

It is an arithmetic number, because the mean of its divisors is an integer number (1009011).

2^2018021 is an apocalyptic number.

It is an amenable number.

2018021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2018021 is an equidigital number, since it uses as much as digits as its factorization.

2018021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2018021 is about 1420.5706599814. The cubic root of 2018021 is about 126.3693913561.

The spelling of 2018021 in words is "two million, eighteen thousand, twenty-one".