2118243380 has 48 divisors (see below), whose sum is σ = 4863075840. Its totient is φ = 768624000.

The previous prime is 2118243349. The next prime is 2118243383. The reversal of 2118243380 is 833428112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118243383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95330 + ... + 115430.

It is an arithmetic number, because the mean of its divisors is an integer number (101314080).

Almost surely, 2^2118243380 is an apocalyptic number.

2118243380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2118243380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2431537920).

2118243380 is an abundant number, since it is smaller than the sum of its proper divisors (2744832460).

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

2118243380 is a wasteful number, since it uses less digits than its factorization.

2118243380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20600 (or 20598 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 2118243380 is about 46024.3781055214. The cubic root of 2118243380 is about 1284.2767468287.

The spelling of 2118243380 in words is "two billion, one hundred eighteen million, two hundred forty-three thousand, three hundred eighty".