2582478221 has 4 divisors (see below), whose sum is σ = 2585423772. Its totient is φ = 2579532672.

The previous prime is 2582478139. The next prime is 2582478257. The reversal of 2582478221 is 1228742852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1021122025 + 1561356196 = 31955^2 + 39514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2582478221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2582478421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1471460 + ... + 1473213.

It is an arithmetic number, because the mean of its divisors is an integer number (646355943).

Almost surely, 2^2582478221 is an apocalyptic number.

It is an amenable number.

2582478221 is a deficient number, since it is larger than the sum of its proper divisors (2945551).

2582478221 is an equidigital number, since it uses as much as digits as its factorization.

2582478221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945550.

The product of its digits is 143360, while the sum is 41.

The square root of 2582478221 is about 50818.0895056081. The cubic root of 2582478221 is about 1371.9729722156.

The spelling of 2582478221 in words is "two billion, five hundred eighty-two million, four hundred seventy-eight thousand, two hundred twenty-one".