2121404 has 24 divisors (see below), whose sum is σ = 3855600. Its totient is φ = 1020800.

The previous prime is 2121403. The next prime is 2121433. The reversal of 2121404 is 4041212.

2121404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121403) by changing a digit.

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, 20954 + ... + 21054.

It is an arithmetic number, because the mean of its divisors is an integer number (160650).

2^2121404 is an apocalyptic number.

It is an amenable number.

2121404 is a deficient number, since it is larger than the sum of its proper divisors (1734196).

2121404 is a wasteful number, since it uses less digits than its factorization.

2121404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2121404 is about 1456.5040336367. The cubic root of 2121404 is about 128.4915183630.

Adding to 2121404 its reverse (4041212), we get a palindrome (6162616).

The spelling of 2121404 in words is "two million, one hundred twenty-one thousand, four hundred four".