2181334784 has 72 divisors (see below), whose sum is σ = 4464096000. Its totient is φ = 1063443456.

The previous prime is 2181334781. The next prime is 2181334811. The reversal of 2181334784 is 4874331812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181334781) by changing a digit.

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, 2098937 + ... + 2099975.

Almost surely, 2^2181334784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181334784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232048000).

2181334784 is an abundant number, since it is smaller than the sum of its proper divisors (2282761216).

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

2181334784 is a wasteful number, since it uses less digits than its factorization.

2181334784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 1239 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 2181334784 is about 46704.7618985473. The cubic root of 2181334784 is about 1296.9028409015.

The spelling of 2181334784 in words is "two billion, one hundred eighty-one million, three hundred thirty-four thousand, seven hundred eighty-four".