2161020260 has 96 divisors (see below), whose sum is σ = 5383445760. Its totient is φ = 712954368.

The previous prime is 2161020217. The next prime is 2161020293. The reversal of 2161020260 is 620201612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1513667 + ... + 1515093.

It is an arithmetic number, because the mean of its divisors is an integer number (56077560).

Almost surely, 2^2161020260 is an apocalyptic number.

2161020260 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 2161020260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2691722880).

2161020260 is an abundant number, since it is smaller than the sum of its proper divisors (3222425500).

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

2161020260 is a wasteful number, since it uses less digits than its factorization.

2161020260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845 (or 1843 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2161020260 is about 46486.7751086263. The cubic root of 2161020260 is about 1292.8643082362.

Adding to 2161020260 its reverse (620201612), we get a palindrome (2781221872).

The spelling of 2161020260 in words is "two billion, one hundred sixty-one million, twenty thousand, two hundred sixty".