2656142321 has 4 divisors (see below), whose sum is σ = 3035591232. Its totient is φ = 2276693412.

The previous prime is 2656142309. The next prime is 2656142323. The reversal of 2656142321 is 1232416562.

2656142321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-2656142321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2656142323) 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, 189724445 + ... + 189724458.

It is an arithmetic number, because the mean of its divisors is an integer number (758897808).

Almost surely, 2^2656142321 is an apocalyptic number.

It is an amenable number.

2656142321 is a deficient number, since it is larger than the sum of its proper divisors (379448911).

2656142321 is an equidigital number, since it uses as much as digits as its factorization.

2656142321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379448910.

The product of its digits is 17280, while the sum is 32.

The square root of 2656142321 is about 51537.7756698909. The cubic root of 2656142321 is about 1384.8958500577.

Adding to 2656142321 its reverse (1232416562), we get a palindrome (3888558883).

The spelling of 2656142321 in words is "two billion, six hundred fifty-six million, one hundred forty-two thousand, three hundred twenty-one".