2115115900 has 18 divisors (see below), whose sum is σ = 4589801720. Its totient is φ = 846046320.

The previous prime is 2115115861. The next prime is 2115115907. The reversal of 2115115900 is 95115112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115115907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10575480 + ... + 10575679.

Almost surely, 2^2115115900 is an apocalyptic number.

2115115900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2115115900 is an abundant number, since it is smaller than the sum of its proper divisors (2474685820).

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

2115115900 is a wasteful number, since it uses less digits than its factorization.

2115115900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21151173 (or 21151166 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 2115115900 is about 45990.3892133998. The cubic root of 2115115900 is about 1283.6443787943.

The spelling of 2115115900 in words is "two billion, one hundred fifteen million, one hundred fifteen thousand, nine hundred".