2660544021 has 24 divisors (see below), whose sum is σ = 3754987200. Its totient is φ = 1672464640.

The previous prime is 2660544011. The next prime is 2660544023. The reversal of 2660544021 is 1204450662.

2660544021 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 2660544021 - 2¹⁵ = 2660511253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2660544021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660544023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344005 + ... + 351653.

It is an arithmetic number, because the mean of its divisors is an integer number (156457800).

Almost surely, 2^2660544021 is an apocalyptic number.

It is an amenable number.

2660544021 is a deficient number, since it is larger than the sum of its proper divisors (1094443179).

2660544021 is an equidigital number, since it uses as much as digits as its factorization.

2660544021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7817 (or 7746 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2660544021 is about 51580.4616206563. The cubic root of 2660544021 is about 1385.6604340666.

Adding to 2660544021 its reverse (1204450662), we get a palindrome (3864994683).

The spelling of 2660544021 in words is "two billion, six hundred sixty million, five hundred forty-four thousand, twenty-one".