2105511320 has 96 divisors (see below), whose sum is σ = 5375583360. Its totient is φ = 740889600.

The previous prime is 2105511299. The next prime is 2105511323. The reversal of 2105511320 is 231155012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 2105511292 and 2105511301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105511323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143024 + ... + 157056.

It is an arithmetic number, because the mean of its divisors is an integer number (55995660).

Almost surely, 2^2105511320 is an apocalyptic number.

2105511320 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 2105511320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2687791680).

2105511320 is an abundant number, since it is smaller than the sum of its proper divisors (3270072040).

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

2105511320 is a wasteful number, since it uses less digits than its factorization.

2105511320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14097 (or 14082 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2105511320 is about 45885.8509782700. The cubic root of 2105511320 is about 1281.6984533050.

Adding to 2105511320 its reverse (231155012), we get a palindrome (2336666332).

The spelling of 2105511320 in words is "two billion, one hundred five million, five hundred eleven thousand, three hundred twenty".