2021841 has 20 divisors (see below), whose sum is σ = 3061300. Its totient is φ = 1329696.

The previous prime is 2021839. The next prime is 2021843. The reversal of 2021841 is 1481202.

It is an interprime number because it is at equal distance from previous prime (2021839) and next prime (2021843).

It can be written as a sum of positive squares in 2 ways, for example, as 1679616 + 342225 = 1296^2 + 585^2 .

It is not a de Polignac number, because 2021841 - 2¹ = 2021839 is a prime.

It is a Duffinian number.

2021841 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2021843) 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 in 19 ways as a sum of consecutive naturals, for example, 8715 + ... + 8943.

It is an arithmetic number, because the mean of its divisors is an integer number (153065).

2^2021841 is an apocalyptic number.

It is an amenable number.

2021841 is a deficient number, since it is larger than the sum of its proper divisors (1039459).

2021841 is a wasteful number, since it uses less digits than its factorization.

2021841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2021841 is about 1421.9145543949. The cubic root of 2021841 is about 126.4490778081.

The spelling of 2021841 in words is "two million, twenty-one thousand, eight hundred forty-one".