2105120520 has 48 divisors (see below), whose sum is σ = 6841642860. Its totient is φ = 561365376.

The previous prime is 2105120509. The next prime is 2105120539. The reversal of 2105120520 is 250215012.

2105120520 is a `hidden beast` number, since 21 + 0 + 5 + 120 + 520 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2089769796 + 15350724 = 45714^2 + 3918^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2105120493 and 2105120502.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2923419 + ... + 2924138.

Almost surely, 2^2105120520 is an apocalyptic number.

2105120520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105120520 is an abundant number, since it is smaller than the sum of its proper divisors (4736522340).

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

2105120520 is a wasteful number, since it uses less digits than its factorization.

2105120520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5847574 (or 5847567 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2105120520 is about 45881.5923873616. The cubic root of 2105120520 is about 1281.6191505178.

Adding to 2105120520 its reverse (250215012), we get a palindrome (2355335532).

The spelling of 2105120520 in words is "two billion, one hundred five million, one hundred twenty thousand, five hundred twenty".