2565104021 has 8 divisors (see below), whose sum is σ = 2648825088. Its totient is φ = 2481444000.

The previous prime is 2565103999. The next prime is 2565104039. The reversal of 2565104021 is 1204015652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565104021 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 (2565104051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79601 + ... + 107081.

It is an arithmetic number, because the mean of its divisors is an integer number (331103136).

Almost surely, 2^2565104021 is an apocalyptic number.

It is an amenable number.

2565104021 is a deficient number, since it is larger than the sum of its proper divisors (83721067).

2565104021 is a wasteful number, since it uses less digits than its factorization.

2565104021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30523.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2565104021 is about 50646.8559833678. The cubic root of 2565104021 is about 1368.8892947595.

Adding to 2565104021 its reverse (1204015652), we get a palindrome (3769119673).

The spelling of 2565104021 in words is "two billion, five hundred sixty-five million, one hundred four thousand, twenty-one".