2160812321 has 4 divisors (see below), whose sum is σ = 2219212692. Its totient is φ = 2102411952.

The previous prime is 2160812309. The next prime is 2160812323. The reversal of 2160812321 is 1232180612.

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 2101213921 + 59598400 = 45839^2 + 7720^2 .

It is a cyclic number.

It is not a de Polignac number, because 2160812321 - 2¹⁰ = 2160811297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2160812323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29200130 + ... + 29200203.

It is an arithmetic number, because the mean of its divisors is an integer number (554803173).

Almost surely, 2^2160812321 is an apocalyptic number.

It is an amenable number.

2160812321 is a deficient number, since it is larger than the sum of its proper divisors (58400371).

2160812321 is an equidigital number, since it uses as much as digits as its factorization.

2160812321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58400370.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2160812321 is about 46484.5385155107. The cubic root of 2160812321 is about 1292.8228393154.

Adding to 2160812321 its reverse (1232180612), we get a palindrome (3392992933).

The spelling of 2160812321 in words is "two billion, one hundred sixty million, eight hundred twelve thousand, three hundred twenty-one".