2015521120 has 24 divisors (see below), whose sum is σ = 4761669024. Its totient is φ = 806208384.

The previous prime is 2015521111. The next prime is 2015521169. The reversal of 2015521120 is 211255102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6298344 + ... + 6298663.

It is an arithmetic number, because the mean of its divisors is an integer number (198402876).

Almost surely, 2^2015521120 is an apocalyptic number.

2015521120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015521120 is an abundant number, since it is smaller than the sum of its proper divisors (2746147904).

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

2015521120 is a wasteful number, since it uses less digits than its factorization.

2015521120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12597022 (or 12597014 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 2015521120 is about 44894.5555719176. Note that the first 4 decimals coincide. The cubic root of 2015521120 is about 1263.1718858733.

Adding to 2015521120 its reverse (211255102), we get a palindrome (2226776222).

The spelling of 2015521120 in words is "two billion, fifteen million, five hundred twenty-one thousand, one hundred twenty".