2181515328 has 140 divisors (see below), whose sum is σ = 6558881472. Its totient is φ = 716808960.

The previous prime is 2181515309. The next prime is 2181515341. The reversal of 2181515328 is 8235151812.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 2181515292 and 2181515301.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 365101 + ... + 371027.

Almost surely, 2^2181515328 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 2181515328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3279440736).

2181515328 is an abundant number, since it is smaller than the sum of its proper divisors (4377366144).

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

2181515328 is an equidigital number, since it uses as much as digits as its factorization.

2181515328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6022 (or 6003 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 2181515328 is about 46706.6946807414. The cubic root of 2181515328 is about 1296.9386204570.

The spelling of 2181515328 in words is "two billion, one hundred eighty-one million, five hundred fifteen thousand, three hundred twenty-eight".