2021004 has 24 divisors (see below), whose sum is σ = 5239920. Its totient is φ = 673632.

The previous prime is 2021003. The next prime is 2021009. The reversal of 2021004 is 4001202.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2021003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9249 + ... + 9464.

It is an arithmetic number, because the mean of its divisors is an integer number (218330).

2^2021004 is an apocalyptic number.

It is an amenable number.

2021004 is an abundant number, since it is smaller than the sum of its proper divisors (3218916).

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

2021004 is a wasteful number, since it uses less digits than its factorization.

2021004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18726 (or 18718 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2021004 is about 1421.6202024451. The cubic root of 2021004 is about 126.4316263061.

Adding to 2021004 its reverse (4001202), we get a palindrome (6022206).

The spelling of 2021004 in words is "two million, twenty-one thousand, four".