2101901872 has 20 divisors (see below), whose sum is σ = 4654211536. Its totient is φ = 900815040.

The previous prime is 2101901863. The next prime is 2101901903. The reversal of 2101901872 is 2781091012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9383379 + ... + 9383602.

Almost surely, 2^2101901872 is an apocalyptic number.

It is an amenable number.

2101901872 is an abundant number, since it is smaller than the sum of its proper divisors (2552309664).

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

2101901872 is a wasteful number, since it uses less digits than its factorization.

2101901872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18766996 (or 18766990 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 2101901872 is about 45846.5033781203. The cubic root of 2101901872 is about 1280.9656352714.

Adding to 2101901872 its reverse (2781091012), we get a palindrome (4882992884).

The spelling of 2101901872 in words is "two billion, one hundred one million, nine hundred one thousand, eight hundred seventy-two".