2865835821 has 4 divisors (see below), whose sum is σ = 3821114432. Its totient is φ = 1910557212.

The previous prime is 2865835799. The next prime is 2865835829. The reversal of 2865835821 is 1285385682.

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 not a de Polignac number, because 2865835821 - 2⁵ = 2865835789 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 (2865835829) 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 in 3 ways as a sum of consecutive naturals, for example, 477639301 + ... + 477639306.

It is an arithmetic number, because the mean of its divisors is an integer number (955278608).

Almost surely, 2^2865835821 is an apocalyptic number.

It is an amenable number.

2865835821 is a deficient number, since it is larger than the sum of its proper divisors (955278611).

2865835821 is an equidigital number, since it uses as much as digits as its factorization.

2865835821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955278610.

The product of its digits is 921600, while the sum is 48.

The square root of 2865835821 is about 53533.5018563142. The cubic root of 2865835821 is about 1420.4210582672.

The spelling of 2865835821 in words is "two billion, eight hundred sixty-five million, eight hundred thirty-five thousand, eight hundred twenty-one".