2605021 has 2 divisors, whose sum is σ = 2605022. Its totient is φ = 2605020.

The previous prime is 2605019. The next prime is 2605039. The reversal of 2605021 is 1205062.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2604996 + 25 = 1614^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 2605021 - 2¹ = 2605019 is a prime.

It is a super-2 number, since 2×2605021² = 13572268820882, which contains 22 as substring.

Together with 2605019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2604986 and 2605004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2605081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1302510 + 1302511.

It is an arithmetic number, because the mean of its divisors is an integer number (1302511).

2^2605021 is an apocalyptic number.

It is an amenable number.

2605021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2605021 is an equidigital number, since it uses as much as digits as its factorization.

2605021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 2605021 is about 1614.0077447150. The cubic root of 2605021 is about 137.5953454404.

The spelling of 2605021 in words is "two million, six hundred five thousand, twenty-one".