2181298752 has 84 divisors (see below), whose sum is σ = 6316917516. Its totient is φ = 719585280.

The previous prime is 2181298709. The next prime is 2181298753. The reversal of 2181298752 is 2578921812.

It can be written as a sum of positive squares in 2 ways, for example, as 1594884096 + 586414656 = 39936^2 + 24216^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2181298698 and 2181298707.

It is not an unprimeable number, because it can be changed into a prime (2181298753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36352 + ... + 75392.

It is an arithmetic number, because the mean of its divisors is an integer number (75201399).

Almost surely, 2^2181298752 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 2181298752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3158458758).

2181298752 is an abundant number, since it is smaller than the sum of its proper divisors (4135618764).

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

2181298752 is a wasteful number, since it uses less digits than its factorization.

2181298752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39156 (or 39143 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 2181298752 is about 46704.3761547031. The cubic root of 2181298752 is about 1296.8956999740.

The spelling of 2181298752 in words is "two billion, one hundred eighty-one million, two hundred ninety-eight thousand, seven hundred fifty-two".