2081721852 has 144 divisors (see below), whose sum is σ = 6365399040. Its totient is φ = 560359296.

The previous prime is 2081721799. The next prime is 2081721857. The reversal of 2081721852 is 2581271802.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081721857) 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 47 ways as a sum of consecutive naturals, for example, 942133 + ... + 944339.

It is an arithmetic number, because the mean of its divisors is an integer number (44204160).

Almost surely, 2^2081721852 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 2081721852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3182699520).

2081721852 is an abundant number, since it is smaller than the sum of its proper divisors (4283677188).

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

2081721852 is a wasteful number, since it uses less digits than its factorization.

2081721852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2440 (or 2435 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 36.

The square root of 2081721852 is about 45625.8901502206. The cubic root of 2081721852 is about 1276.8529974869.

The spelling of 2081721852 in words is "two billion, eighty-one million, seven hundred twenty-one thousand, eight hundred fifty-two".