2605412021 has 4 divisors (see below), whose sum is σ = 2638392000. Its totient is φ = 2572432044.

The previous prime is 2605412003. The next prime is 2605412039. The reversal of 2605412021 is 1202145062.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2605412003) and next prime (2605412039).

It is a cyclic number.

It is not a de Polignac number, because 2605412021 - 2³⁰ = 1531670197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605412321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16489871 + ... + 16490028.

It is an arithmetic number, because the mean of its divisors is an integer number (659598000).

Almost surely, 2^2605412021 is an apocalyptic number.

It is an amenable number.

2605412021 is a deficient number, since it is larger than the sum of its proper divisors (32979979).

2605412021 is an equidigital number, since it uses as much as digits as its factorization.

2605412021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32979978.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 2605412021 is about 51043.2367802043. The cubic root of 2605412021 is about 1376.0222957912.

Adding to 2605412021 its reverse (1202145062), we get a palindrome (3807557083).

The spelling of 2605412021 in words is "two billion, six hundred five million, four hundred twelve thousand, twenty-one".