2181548620 has 48 divisors (see below), whose sum is σ = 4822856640. Its totient is φ = 827273216.

The previous prime is 2181548587. The next prime is 2181548651. The reversal of 2181548620 is 268451812.

It is a self number, because there is not a number n which added to its sum of digits gives 2181548620.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30996 + ... + 72964.

It is an arithmetic number, because the mean of its divisors is an integer number (100476180).

Almost surely, 2^2181548620 is an apocalyptic number.

2181548620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181548620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2411428320).

2181548620 is an abundant number, since it is smaller than the sum of its proper divisors (2641308020).

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

2181548620 is a wasteful number, since it uses less digits than its factorization.

2181548620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42114 (or 42112 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 2181548620 is about 46707.0510736869. The cubic root of 2181548620 is about 1296.9452179293.

The spelling of 2181548620 in words is "two billion, one hundred eighty-one million, five hundred forty-eight thousand, six hundred twenty".