2105131500520 has 128 divisors (see below), whose sum is σ = 4878977444640. Its totient is φ = 816870666240.

The previous prime is 2105131500499. The next prime is 2105131500523. The reversal of 2105131500520 is 250051315012.

It can be written as a sum of positive squares in 16 ways, for example, as 478634283556 + 1626497216964 = 691834^2 + 1275342^2 .

It is not an unprimeable number, because it can be changed into a prime (2105131500523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1025391814 + ... + 1025393866.

Almost surely, 2^{2105131500520} is an apocalyptic number.

2105131500520 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 2105131500520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2439488722320).

2105131500520 is an abundant number, since it is smaller than the sum of its proper divisors (2773845944120).

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

2105131500520 is a wasteful number, since it uses less digits than its factorization.

2105131500520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3815 (or 3811 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 2105131500520 its reverse (250051315012), we get a palindrome (2355182815532).

The spelling of 2105131500520 in words is "two trillion, one hundred five billion, one hundred thirty-one million, five hundred thousand, five hundred twenty".