2181840211 has 2 divisors, whose sum is σ = 2181840212. Its totient is φ = 2181840210.

The previous prime is 2181840209. The next prime is 2181840263. The reversal of 2181840211 is 1120481812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2181840211 - 2¹ = 2181840209 is a prime.

Together with 2181840209, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2181840211.

It is not a weakly prime, because it can be changed into another prime (2181840811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090920105 + 1090920106.

It is an arithmetic number, because the mean of its divisors is an integer number (1090920106).

Almost surely, 2^2181840211 is an apocalyptic number.

2181840211 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181840211 is an equidigital number, since it uses as much as digits as its factorization.

2181840211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 2181840211 is about 46710.1724573995. The cubic root of 2181840211 is about 1297.0029996203.

The spelling of 2181840211 in words is "two billion, one hundred eighty-one million, eight hundred forty thousand, two hundred eleven".