2181510468 has 60 divisors (see below), whose sum is σ = 5709406780. Its totient is φ = 726340608.

The previous prime is 2181510449. The next prime is 2181510469. The reversal of 2181510468 is 8640151812.

2181510468 is a `hidden beast` number, since 2 + 1 + 81 + 510 + 4 + 68 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 313714944 + 1867795524 = 17712^2 + 43218^2 .

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

It is not an unprimeable number, because it can be changed into a prime (2181510469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 323580 + ... + 330252.

Almost surely, 2^2181510468 is an apocalyptic number.

It is an amenable number.

2181510468 is an abundant number, since it is smaller than the sum of its proper divisors (3527896312).

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

2181510468 is a wasteful number, since it uses less digits than its factorization.

2181510468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7698 (or 7687 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 2181510468 is about 46706.6426539095. The cubic root of 2181510468 is about 1296.9376573457.

The spelling of 2181510468 in words is "two billion, one hundred eighty-one million, five hundred ten thousand, four hundred sixty-eight".