2181374980 has 24 divisors (see below), whose sum is σ = 4581866520. Its totient is φ = 872363520.

The previous prime is 2181374957. The next prime is 2181374999. The reversal of 2181374980 is 894731812.

It can be written as a sum of positive squares in 4 ways, for example, as 167340096 + 2014034884 = 12936^2 + 44878^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121206 + ... + 138034.

It is an arithmetic number, because the mean of its divisors is an integer number (190911105).

Almost surely, 2^2181374980 is an apocalyptic number.

2181374980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181374980 is an abundant number, since it is smaller than the sum of its proper divisors (2400491540).

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

2181374980 is a wasteful number, since it uses less digits than its factorization.

2181374980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23319 (or 23317 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 2181374980 is about 46705.1922167118. The cubic root of 2181374980 is about 1296.9108069699.

The spelling of 2181374980 in words is "two billion, one hundred eighty-one million, three hundred seventy-four thousand, nine hundred eighty".