2115530000 has 100 divisors (see below), whose sum is σ = 5181638220. Its totient is φ = 836352000.

The previous prime is 2115529973. The next prime is 2115530009. The reversal of 2115530000 is 355112.

It can be written as a sum of positive squares in 10 ways, for example, as 1950458896 + 165071104 = 44164^2 + 12848^2 .

It is a tau number, because it is divible by the number of its divisors (100).

It is not an unprimeable number, because it can be changed into a prime (2115530009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 888812 + ... + 891188.

Almost surely, 2^2115530000 is an apocalyptic number.

2115530000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2115530000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2590819110).

2115530000 is an abundant number, since it is smaller than the sum of its proper divisors (3066108220).

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

2115530000 is an equidigital number, since it uses as much as digits as its factorization.

2115530000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494 (or 2473 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 2115530000 is about 45994.8910206340. The cubic root of 2115530000 is about 1283.7281444879.

Adding to 2115530000 its reverse (355112), we get a palindrome (2115885112).

The spelling of 2115530000 in words is "two billion, one hundred fifteen million, five hundred thirty thousand".