2101504520 has 16 divisors (see below), whose sum is σ = 4728385260. Its totient is φ = 840601792.

The previous prime is 2101504511. The next prime is 2101504541. The reversal of 2101504520 is 254051012.

It can be written as a sum of positive squares in 2 ways, for example, as 1926683236 + 174821284 = 43894^2 + 13222^2 .

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 = 2101504492 and 2101504501.

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 3 ways as a sum of consecutive naturals, for example, 26268767 + ... + 26268846.

Almost surely, 2^2101504520 is an apocalyptic number.

2101504520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101504520 is an abundant number, since it is smaller than the sum of its proper divisors (2626880740).

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

2101504520 is a wasteful number, since it uses less digits than its factorization.

2101504520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52537624 (or 52537620 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2101504520 is about 45842.1696694212. The cubic root of 2101504520 is about 1280.8849105491.

Adding to 2101504520 its reverse (254051012), we get a palindrome (2355555532).

The spelling of 2101504520 in words is "two billion, one hundred one million, five hundred four thousand, five hundred twenty".