2181874878920 has 32 divisors (see below), whose sum is σ = 5355511067520. Its totient is φ = 793409046720.

The previous prime is 2181874878919. The next prime is 2181874878923. The reversal of 2181874878920 is 298784781812.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2181874878923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2479402832 + ... + 2479403711.

It is an arithmetic number, because the mean of its divisors is an integer number (167359720860).

Almost surely, 2^{2181874878920} is an apocalyptic number.

2181874878920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181874878920 is an abundant number, since it is smaller than the sum of its proper divisors (3173636188600).

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

2181874878920 is a wasteful number, since it uses less digits than its factorization.

2181874878920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4958806565 (or 4958806561 counting only the distinct ones).

The product of its (nonzero) digits is 28901376, while the sum is 65.

The spelling of 2181874878920 in words is "two trillion, one hundred eighty-one billion, eight hundred seventy-four million, eight hundred seventy-eight thousand, nine hundred twenty".