2115510120 has 96 divisors (see below), whose sum is σ = 6929694720. Its totient is φ = 559681920.

The previous prime is 2115510071. The next prime is 2115510121. The reversal of 2115510120 is 210155112.

2115510120 is a `hidden beast` number, since 21 + 15 + 510 + 120 = 666.

2115510120 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 2115510093 and 2115510102.

It is not an unprimeable number, because it can be changed into a prime (2115510121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22585 + ... + 68855.

It is an arithmetic number, because the mean of its divisors is an integer number (72184320).

Almost surely, 2^2115510120 is an apocalyptic number.

2115510120 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 2115510120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3464847360).

2115510120 is an abundant number, since it is smaller than the sum of its proper divisors (4814184600).

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

2115510120 is a wasteful number, since it uses less digits than its factorization.

2115510120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46415 (or 46408 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 2115510120 is about 45994.6749091675. The cubic root of 2115510120 is about 1283.7241233371.

Adding to 2115510120 its reverse (210155112), we get a palindrome (2325665232).

The spelling of 2115510120 in words is "two billion, one hundred fifteen million, five hundred ten thousand, one hundred twenty".