2015040321 has 48 divisors (see below), whose sum is σ = 3568656000. Its totient is φ = 1111719168.

The previous prime is 2015040317. The next prime is 2015040323. The reversal of 2015040321 is 1230405102.

It is not a de Polignac number, because 2015040321 - 2² = 2015040317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2015040294 and 2015040303.

It is not an unprimeable number, because it can be changed into a prime (2015040323) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 28905 + ... + 69753.

It is an arithmetic number, because the mean of its divisors is an integer number (74347000).

Almost surely, 2^2015040321 is an apocalyptic number.

2015040321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2015040321 is a deficient number, since it is larger than the sum of its proper divisors (1553615679).

2015040321 is an equidigital number, since it uses as much as digits as its factorization.

2015040321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40900 (or 40888 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2015040321 is about 44889.2004941055. The cubic root of 2015040321 is about 1263.0714354120.

Adding to 2015040321 its reverse (1230405102), we get a palindrome (3245445423).

The spelling of 2015040321 in words is "two billion, fifteen million, forty thousand, three hundred twenty-one".