2181015936 has 256 divisors, whose sum is σ = 7103116800. Its totient is φ = 653322240.

The previous prime is 2181015919. The next prime is 2181015937. The reversal of 2181015936 is 6395101812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2181015936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181015937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3915370 + ... + 3915926.

It is an arithmetic number, because the mean of its divisors is an integer number (27746550).

Almost surely, 2^2181015936 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 2181015936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3551558400).

2181015936 is an abundant number, since it is smaller than the sum of its proper divisors (4922100864).

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

2181015936 is a wasteful number, since it uses less digits than its factorization.

2181015936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 2181015936 is about 46701.3483317131. The cubic root of 2181015936 is about 1296.8396479383.

The spelling of 2181015936 in words is "two billion, one hundred eighty-one million, fifteen thousand, nine hundred thirty-six".