2181015860 has 12 divisors (see below), whose sum is σ = 4580133348. Its totient is φ = 872406336.

The previous prime is 2181015853. The next prime is 2181015877. The reversal of 2181015860 is 685101812.

It can be written as a sum of positive squares in 2 ways, for example, as 1049500816 + 1131515044 = 32396^2 + 33638^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 54525377 + ... + 54525416.

It is an arithmetic number, because the mean of its divisors is an integer number (381677779).

Almost surely, 2^2181015860 is an apocalyptic number.

2181015860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181015860 is an abundant number, since it is smaller than the sum of its proper divisors (2399117488).

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

2181015860 is a wasteful number, since it uses less digits than its factorization.

2181015860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109050802 (or 109050800 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 2181015860 is about 46701.3475180321. The cubic root of 2181015860 is about 1296.8396328750.

The spelling of 2181015860 in words is "two billion, one hundred eighty-one million, fifteen thousand, eight hundred sixty".