2056121365 has 4 divisors (see below), whose sum is σ = 2467345644. Its totient is φ = 1644897088.

The previous prime is 2056121297. The next prime is 2056121371. The reversal of 2056121365 is 5631216502.

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 1447117681 + 609003684 = 38041^2 + 24678^2 .

It is a cyclic number.

It is not a de Polignac number, because 2056121365 - 2¹⁵ = 2056088597 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 205612132 + ... + 205612141.

It is an arithmetic number, because the mean of its divisors is an integer number (616836411).

Almost surely, 2^2056121365 is an apocalyptic number.

It is an amenable number.

2056121365 is a deficient number, since it is larger than the sum of its proper divisors (411224279).

2056121365 is an equidigital number, since it uses as much as digits as its factorization.

2056121365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411224278.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2056121365 is about 45344.4744704358. The cubic root of 2056121365 is about 1271.5972556174.

Adding to 2056121365 its reverse (5631216502), we get a palindrome (7687337867).

The spelling of 2056121365 in words is "two billion, fifty-six million, one hundred twenty-one thousand, three hundred sixty-five".