2121704 has 32 divisors (see below), whose sum is σ = 4475520. Its totient is φ = 935616.

The previous prime is 2121683. The next prime is 2121737. The reversal of 2121704 is 4071212.

2121704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1949 + ... + 2835.

It is an arithmetic number, because the mean of its divisors is an integer number (139860).

2^2121704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2237760).

2121704 is an abundant number, since it is smaller than the sum of its proper divisors (2353816).

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

2121704 is a wasteful number, since it uses less digits than its factorization.

2121704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 2121704 is about 1456.6070163225. The cubic root of 2121704 is about 128.4975749869.

Adding to 2121704 its reverse (4071212), we get a palindrome (6192916).

The spelling of 2121704 in words is "two million, one hundred twenty-one thousand, seven hundred four".