2181741804 has 360 divisors, whose sum is σ = 6894241200. Its totient is φ = 598752000.

The previous prime is 2181741803. The next prime is 2181741811. The reversal of 2181741804 is 4081471812.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2181741803) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 21601354 + ... + 21601454.

It is an arithmetic number, because the mean of its divisors is an integer number (19150670).

Almost surely, 2^2181741804 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 2181741804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3447120600).

2181741804 is an abundant number, since it is smaller than the sum of its proper divisors (4712499396).

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

2181741804 is a wasteful number, since it uses less digits than its factorization.

2181741804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 2181741804 is about 46709.1190668375. The cubic root of 2181741804 is about 1296.9834998586.

The spelling of 2181741804 in words is "two billion, one hundred eighty-one million, seven hundred forty-one thousand, eight hundred four".