2101684 has 18 divisors (see below), whose sum is σ = 3983910. Its totient is φ = 969696.

The previous prime is 2101681. The next prime is 2101703. The reversal of 2101684 is 4861012.

It can be written as a sum of positive squares in 3 ways, for example, as 62500 + 2039184 = 250^2 + 1428^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 879 + ... + 2230.

2^2101684 is an apocalyptic number.

It is an amenable number.

2101684 is a deficient number, since it is larger than the sum of its proper divisors (1882226).

2101684 is a wasteful number, since it uses less digits than its factorization.

2101684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3139 (or 3124 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2101684 is about 1449.7185933829. The cubic root of 2101684 is about 128.0921374374.

Adding to 2101684 its reverse (4861012), we get a palindrome (6962696).

The spelling of 2101684 in words is "two million, one hundred one thousand, six hundred eighty-four".