2015521002 has 64 divisors (see below), whose sum is σ = 4911707520. Its totient is φ = 607564800.

The previous prime is 2015520979. The next prime is 2015521019. The reversal of 2015521002 is 2001255102.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105852 + ... + 123432.

It is an arithmetic number, because the mean of its divisors is an integer number (76745430).

Almost surely, 2^2015521002 is an apocalyptic number.

2015521002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2015521002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2455853760).

2015521002 is an abundant number, since it is smaller than the sum of its proper divisors (2896186518).

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

2015521002 is a wasteful number, since it uses less digits than its factorization.

2015521002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17796 (or 17790 counting only the distinct ones).

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

The square root of 2015521002 is about 44894.5542577271. The cubic root of 2015521002 is about 1263.1718612222.

Adding to 2015521002 its reverse (2001255102), we get a palindrome (4016776104).

The spelling of 2015521002 in words is "two billion, fifteen million, five hundred twenty-one thousand, two".