2118911720 has 16 divisors (see below), whose sum is σ = 4767551460. Its totient is φ = 847564672.

The previous prime is 2118911719. The next prime is 2118911723. The reversal of 2118911720 is 271198112.

It can be written as a sum of positive squares in 2 ways, for example, as 2020862116 + 98049604 = 44954^2 + 9902^2 .

It is not an unprimeable number, because it can be changed into a prime (2118911723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26486357 + ... + 26486436.

Almost surely, 2^2118911720 is an apocalyptic number.

2118911720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2118911720 is an abundant number, since it is smaller than the sum of its proper divisors (2648639740).

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

2118911720 is a wasteful number, since it uses less digits than its factorization.

2118911720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52972804 (or 52972800 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 32.

The square root of 2118911720 is about 46031.6382502296. The cubic root of 2118911720 is about 1284.4118026446.

The spelling of 2118911720 in words is "two billion, one hundred eighteen million, nine hundred eleven thousand, seven hundred twenty".