2398108921 has 24 divisors (see below), whose sum is σ = 2770671624. Its totient is φ = 2062506240.

The previous prime is 2398108879. The next prime is 2398108987. The reversal of 2398108921 is 1298018932.

It can be written as a sum of positive squares in 4 ways, for example, as 213481321 + 2184627600 = 14611^2 + 46740^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2398108921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2398108021) 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, 282085 + ... + 290461.

It is an arithmetic number, because the mean of its divisors is an integer number (115444651).

Almost surely, 2^2398108921 is an apocalyptic number.

It is an amenable number.

2398108921 is a deficient number, since it is larger than the sum of its proper divisors (372562703).

2398108921 is a wasteful number, since it uses less digits than its factorization.

2398108921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8489 (or 8470 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 2398108921 is about 48970.4903079395. The cubic root of 2398108921 is about 1338.5141548196.

The spelling of 2398108921 in words is "two billion, three hundred ninety-eight million, one hundred eight thousand, nine hundred twenty-one".