2218918771 has 4 divisors (see below), whose sum is σ = 2219017752. Its totient is φ = 2218819792.

The previous prime is 2218918717. The next prime is 2218918783. The reversal of 2218918771 is 1778198122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2218918771 - 2⁷ = 2218918643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2218918711) 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, 1980 + ... + 66646.

It is an arithmetic number, because the mean of its divisors is an integer number (554754438).

Almost surely, 2^2218918771 is an apocalyptic number.

2218918771 is a deficient number, since it is larger than the sum of its proper divisors (98981).

2218918771 is an equidigital number, since it uses as much as digits as its factorization.

2218918771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98980.

The product of its digits is 112896, while the sum is 46.

The square root of 2218918771 is about 47105.4006564003. The cubic root of 2218918771 is about 1304.3089309941.

The spelling of 2218918771 in words is "two billion, two hundred eighteen million, nine hundred eighteen thousand, seven hundred seventy-one".