2161242104 has 64 divisors (see below), whose sum is σ = 4840819200. Its totient is φ = 884467584.

The previous prime is 2161242103. The next prime is 2161242119. The reversal of 2161242104 is 4012421612.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 2161242104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161242103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1064162 + ... + 1066190.

It is an arithmetic number, because the mean of its divisors is an integer number (75637800).

Almost surely, 2^2161242104 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 2161242104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2420409600).

2161242104 is an abundant number, since it is smaller than the sum of its proper divisors (2679577096).

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

2161242104 is a wasteful number, since it uses less digits than its factorization.

2161242104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892 (or 2888 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 2161242104 is about 46489.1611453681. The cubic root of 2161242104 is about 1292.9085472748.

Adding to 2161242104 its reverse (4012421612), we get a palindrome (6173663716).

The spelling of 2161242104 in words is "two billion, one hundred sixty-one million, two hundred forty-two thousand, one hundred four".