2108421915 has 32 divisors (see below), whose sum is σ = 3433728000. Its totient is φ = 1104554880.

The previous prime is 2108421907. The next prime is 2108421919. The reversal of 2108421915 is 5191248012.

It is not a de Polignac number, because 2108421915 - 2³ = 2108421907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2108421919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231345 + ... + 240285.

It is an arithmetic number, because the mean of its divisors is an integer number (107304000).

Almost surely, 2^2108421915 is an apocalyptic number.

2108421915 is a deficient number, since it is larger than the sum of its proper divisors (1325306085).

2108421915 is a wasteful number, since it uses less digits than its factorization.

2108421915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9227.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 2108421915 is about 45917.5556296282. Note that the first 3 decimals coincide. The cubic root of 2108421915 is about 1282.2887750659.

Adding to 2108421915 its reverse (5191248012), we get a palindrome (7299669927).

The spelling of 2108421915 in words is "two billion, one hundred eight million, four hundred twenty-one thousand, nine hundred fifteen".