18012220211 has 2 divisors, whose sum is σ = 18012220212. Its totient is φ = 18012220210.

The previous prime is 18012220159. The next prime is 18012220217. The reversal of 18012220211 is 11202221081.

It is a strong prime.

It is an emirp because it is prime and its reverse (11202221081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18012220211 - 2¹⁴ = 18012203827 is a prime.

It is not a weakly prime, because it can be changed into another prime (18012220217) by changing a digit.

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 as a sum of consecutive naturals, namely, 9006110105 + 9006110106.

It is an arithmetic number, because the mean of its divisors is an integer number (9006110106).

Almost surely, 2^18012220211 is an apocalyptic number.

18012220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

18012220211 is an equidigital number, since it uses as much as digits as its factorization.

18012220211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 18012220211 its reverse (11202221081), we get a palindrome (29214441292).

The spelling of 18012220211 in words is "eighteen billion, twelve million, two hundred twenty thousand, two hundred eleven".