2665021 has 2 divisors, whose sum is σ = 2665022. Its totient is φ = 2665020.

The previous prime is 2665009. The next prime is 2665027. The reversal of 2665021 is 1205662.

2665021 is digitally balanced in base 2, 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., 2604996 + 60025 = 1614^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665021 - 2⁵ = 2664989 is a prime.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 2664983 and 2665001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2665027) 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 as a sum of consecutive naturals, namely, 1332510 + 1332511.

It is an arithmetic number, because the mean of its divisors is an integer number (1332511).

2^2665021 is an apocalyptic number.

It is an amenable number.

2665021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665021 is an equidigital number, since it uses as much as digits as its factorization.

2665021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2665021 is about 1632.4892036396. The cubic root of 2665021 is about 138.6437229616.

The spelling of 2665021 in words is "two million, six hundred sixty-five thousand, twenty-one".