2118181821920 has 48 divisors (see below), whose sum is σ = 5176763343360. Its totient is φ = 818056425984.

The previous prime is 2118181821919. The next prime is 2118181821979. The reversal of 2118181821920 is 291281818112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228247712 + ... + 228256991.

It is an arithmetic number, because the mean of its divisors is an integer number (107849236320).

Almost surely, 2^{2118181821920} is an apocalyptic number.

2118181821920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2118181821920 is an abundant number, since it is smaller than the sum of its proper divisors (3058581521440).

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

2118181821920 is a wasteful number, since it uses less digits than its factorization.

2118181821920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456504747 (or 456504739 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 44.

The spelling of 2118181821920 in words is "two trillion, one hundred eighteen billion, one hundred eighty-one million, eight hundred twenty-one thousand, nine hundred twenty".