2178320213 has 2 divisors, whose sum is σ = 2178320214. Its totient is φ = 2178320212.

The previous prime is 2178320161. The next prime is 2178320371. The reversal of 2178320213 is 3120238712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1681164004 + 497156209 = 41002^2 + 22297^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178320213 - 2¹⁰ = 2178319189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2178320813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089160106 + 1089160107.

It is an arithmetic number, because the mean of its divisors is an integer number (1089160107).

Almost surely, 2^2178320213 is an apocalyptic number.

It is an amenable number.

2178320213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178320213 is an equidigital number, since it uses as much as digits as its factorization.

2178320213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 2178320213 is about 46672.4781107667. The cubic root of 2178320213 is about 1296.3051322399.

Adding to 2178320213 its reverse (3120238712), we get a palindrome (5298558925).

The spelling of 2178320213 in words is "two billion, one hundred seventy-eight million, three hundred twenty thousand, two hundred thirteen".