2021404 has 24 divisors (see below), whose sum is σ = 4411008. Its totient is φ = 787440.

The previous prime is 2021381. The next prime is 2021431. The reversal of 2021404 is 4041202.

It is a congruent number.

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, 2974 + ... + 3589.

It is an arithmetic number, because the mean of its divisors is an integer number (183792).

2^2021404 is an apocalyptic number.

It is an amenable number.

2021404 is an abundant number, since it is smaller than the sum of its proper divisors (2389604).

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

2021404 is a wasteful number, since it uses less digits than its factorization.

2021404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6585 (or 6583 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2021404 is about 1421.7608800357. The cubic root of 2021404 is about 126.4399669319.

Adding to 2021404 its reverse (4041202), we get a palindrome (6062606).

The spelling of 2021404 in words is "two million, twenty-one thousand, four hundred four".