2544021 has 16 divisors (see below), whose sum is σ = 3835200. Its totient is φ = 1666224.

The previous prime is 2544011. The next prime is 2544029. The reversal of 2544021 is 1204452.

2544021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2544021 - 2⁹ = 2543509 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2543985 and 2544003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2544029) 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 15 ways as a sum of consecutive naturals, for example, 795 + ... + 2391.

It is an arithmetic number, because the mean of its divisors is an integer number (239700).

2^2544021 is an apocalyptic number.

It is an amenable number.

2544021 is a deficient number, since it is larger than the sum of its proper divisors (1291179).

2544021 is a wasteful number, since it uses less digits than its factorization.

2544021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665 (or 1659 counting only the distinct ones).

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

The square root of 2544021 is about 1594.9987460810. The cubic root of 2544021 is about 136.5128595541.

Adding to 2544021 its reverse (1204452), we get a palindrome (3748473).

The spelling of 2544021 in words is "two million, five hundred forty-four thousand, twenty-one".