6541021 has 2 divisors, whose sum is σ = 6541022. Its totient is φ = 6541020.

The previous prime is 6540983. The next prime is 6541033. The reversal of 6541021 is 1201456.

6541021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6528025 + 12996 = 2555^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 6541021 - 2⁷ = 6540893 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6541021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6541061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270510 + 3270511.

It is an arithmetic number, because the mean of its divisors is an integer number (3270511).

Almost surely, 2^6541021 is an apocalyptic number.

It is an amenable number.

6541021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6541021 is an equidigital number, since it uses as much as digits as its factorization.

6541021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 6541021 is about 2557.5419840151. The cubic root of 6541021 is about 187.0173280291.

Adding to 6541021 its reverse (1201456), we get a palindrome (7742477).

The spelling of 6541021 in words is "six million, five hundred forty-one thousand, twenty-one".