2021020181 has 2 divisors, whose sum is σ = 2021020182. Its totient is φ = 2021020180.

The previous prime is 2021020171. The next prime is 2021020213. The reversal of 2021020181 is 1810201202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2019154225 + 1865956 = 44935^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021020181 - 2³⁰ = 947278357 is a prime.

It is a super-2 number, since 2×2021020181² = 8169045144018545522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021020171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010510090 + 1010510091.

It is an arithmetic number, because the mean of its divisors is an integer number (1010510091).

Almost surely, 2^2021020181 is an apocalyptic number.

It is an amenable number.

2021020181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021020181 is an equidigital number, since it uses as much as digits as its factorization.

2021020181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 2021020181 is about 44955.7580405447. The cubic root of 2021020181 is about 1264.3196372665.

Adding to 2021020181 its reverse (1810201202), we get a palindrome (3831221383).

The spelling of 2021020181 in words is "two billion, twenty-one million, twenty thousand, one hundred eighty-one".