2021684 has 24 divisors (see below), whose sum is σ = 4088448. Its totient is φ = 856800.

The previous prime is 2021671. The next prime is 2021693. The reversal of 2021684 is 4861202.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2534 + ... + 3234.

It is an arithmetic number, because the mean of its divisors is an integer number (170352).

2^2021684 is an apocalyptic number.

It is an amenable number.

2021684 is an abundant number, since it is smaller than the sum of its proper divisors (2066764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2021684 is a wasteful number, since it uses less digits than its factorization.

2021684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 813 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 2021684 is about 1421.8593460677. The cubic root of 2021684 is about 126.4458047154.

Adding to 2021684 its reverse (4861202), we get a palindrome (6882886).

The spelling of 2021684 in words is "two million, twenty-one thousand, six hundred eighty-four".