2121111218 has 8 divisors (see below), whose sum is σ = 3181870848. Its totient is φ = 1060487604.

The previous prime is 2121111217. The next prime is 2121111229. The reversal of 2121111218 is 8121111212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2121111218² = 8998225598250887048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121111218.

It is not an unprimeable number, because it can be changed into a prime (2121111217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26555 + ... + 70337.

It is an arithmetic number, because the mean of its divisors is an integer number (397733856).

Almost surely, 2^2121111218 is an apocalyptic number.

2121111218 is a deficient number, since it is larger than the sum of its proper divisors (1060759630).

2121111218 is a wasteful number, since it uses less digits than its factorization.

2121111218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68008.

The product of its digits is 64, while the sum is 20.

The square root of 2121111218 is about 46055.5232084057. The cubic root of 2121111218 is about 1284.8560691088.

The spelling of 2121111218 in words is "two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred eighteen".