2178215113 has 4 divisors (see below), whose sum is σ = 2181511108. Its totient is φ = 2174919120.

The previous prime is 2178215111. The next prime is 2178215153. The reversal of 2178215113 is 3115128712.

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 990172089 + 1188043024 = 31467^2 + 34468^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178215113 - 2¹ = 2178215111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2178215111) 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, 1647006 + ... + 1648327.

It is an arithmetic number, because the mean of its divisors is an integer number (545377777).

Almost surely, 2^2178215113 is an apocalyptic number.

It is an amenable number.

2178215113 is a deficient number, since it is larger than the sum of its proper divisors (3295995).

2178215113 is an equidigital number, since it uses as much as digits as its factorization.

2178215113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295994.

The product of its digits is 3360, while the sum is 31.

The square root of 2178215113 is about 46671.3521659701. The cubic root of 2178215113 is about 1296.2842837806.

The spelling of 2178215113 in words is "two billion, one hundred seventy-eight million, two hundred fifteen thousand, one hundred thirteen".