2021836 has 6 divisors (see below), whose sum is σ = 3538220. Its totient is φ = 1010916.

The previous prime is 2021807. The next prime is 2021837. The reversal of 2021836 is 6381202.

It is not an unprimeable number, because it can be changed into a prime (2021837) 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, 252726 + ... + 252733.

2^2021836 is an apocalyptic number.

It is an amenable number.

2021836 is a deficient number, since it is larger than the sum of its proper divisors (1516384).

2021836 is a wasteful number, since it uses less digits than its factorization.

2021836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505463 (or 505461 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2021836 is about 1421.9127962009. The cubic root of 2021836 is about 126.4489735721.

The spelling of 2021836 in words is "two million, twenty-one thousand, eight hundred thirty-six".