2161105080 has 128 divisors (see below), whose sum is σ = 6708744000. Its totient is φ = 556544000.

The previous prime is 2161105069. The next prime is 2161105097. The reversal of 2161105080 is 805011612.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2161105080.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494746 + ... + 499094.

Almost surely, 2^2161105080 is an apocalyptic number.

2161105080 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 2161105080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3354372000).

2161105080 is an abundant number, since it is smaller than the sum of its proper divisors (4547638920).

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

2161105080 is a wasteful number, since it uses less digits than its factorization.

2161105080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505 (or 4501 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 2161105080 is about 46487.6874021498. The cubic root of 2161105080 is about 1292.8812229806.

Adding to 2161105080 its reverse (805011612), we get a palindrome (2966116692).

The spelling of 2161105080 in words is "two billion, one hundred sixty-one million, one hundred five thousand, eighty".