2021504 has 32 divisors (see below), whose sum is σ = 4268700. Its totient is φ = 950272.

The previous prime is 2021501. The next prime is 2021507. The reversal of 2021504 is 4051202.

It is an interprime number because it is at equal distance from previous prime (2021501) and next prime (2021507).

It can be written as a sum of positive squares in 2 ways, for example, as 1960000 + 61504 = 1400^2 + 248^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (2021501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1712 + ... + 2640.

2^2021504 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 2021504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2134350).

2021504 is an abundant number, since it is smaller than the sum of its proper divisors (2247196).

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

2021504 is an equidigital number, since it uses as much as digits as its factorization.

2021504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2021504 is about 1421.7960472585. The cubic root of 2021504 is about 126.4420519165.

Adding to 2021504 its reverse (4051202), we get a palindrome (6072706).

The spelling of 2021504 in words is "two million, twenty-one thousand, five hundred four".