2021544 has 96 divisors (see below), whose sum is σ = 6566400. Its totient is φ = 574560.

The previous prime is 2021533. The next prime is 2021549. The reversal of 2021544 is 4451202.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021549) 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 23 ways as a sum of consecutive naturals, for example, 10489 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (68400).

2^2021544 is an apocalyptic number.

2021544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3283200).

2021544 is an abundant number, since it is smaller than the sum of its proper divisors (4544856).

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

2021544 is a wasteful number, since it uses less digits than its factorization.

2021544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 2021544 is about 1421.8101139041. The cubic root of 2021544 is about 126.4428858910.

Adding to 2021544 its reverse (4451202), we get a palindrome (6472746).

The spelling of 2021544 in words is "two million, twenty-one thousand, five hundred forty-four".