2181502368 has 216 divisors, whose sum is σ = 6624963072. Its totient is φ = 706091904.

The previous prime is 2181502307. The next prime is 2181502381. The reversal of 2181502368 is 8632051812.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (216).

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17177121 + ... + 17177247.

Almost surely, 2^2181502368 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 2181502368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3312481536).

2181502368 is an abundant number, since it is smaller than the sum of its proper divisors (4443460704).

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

2181502368 is an equidigital number, since it uses as much as digits as its factorization.

2181502368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 2181502368 is about 46706.5559423942. Note that the first 3 decimals coincide. The cubic root of 2181502368 is about 1296.9360521570.

The spelling of 2181502368 in words is "two billion, one hundred eighty-one million, five hundred two thousand, three hundred sixty-eight".