2121100218 has 48 divisors (see below), whose sum is σ = 4649052096. Its totient is φ = 698855040.

The previous prime is 2121100213. The next prime is 2121100229. The reversal of 2121100218 is 8120011212.

It is a super-2 number, since 2×2121100218² = 8998132269599295048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 2121100218.

It is not an unprimeable number, because it can be changed into a prime (2121100211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1810773 + ... + 1811943.

It is an arithmetic number, because the mean of its divisors is an integer number (96855252).

Almost surely, 2^2121100218 is an apocalyptic number.

2121100218 is an abundant number, since it is smaller than the sum of its proper divisors (2527951878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121100218 is a wasteful number, since it uses less digits than its factorization.

2121100218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259 (or 2256 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 2121100218 is about 46055.4037871779. The cubic root of 2121100218 is about 1284.8538480338.

The spelling of 2121100218 in words is "two billion, one hundred twenty-one million, one hundred thousand, two hundred eighteen".