2109872651988 has 96 divisors (see below), whose sum is σ = 5241409689600. Its totient is φ = 658658601216.

The previous prime is 2109872651959. The next prime is 2109872652001. The reversal of 2109872651988 is 8891562789012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177488181 + ... + 177500067.

It is an arithmetic number, because the mean of its divisors is an integer number (54598017600).

Almost surely, 2^{2109872651988} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2109872651988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2620704844800).

2109872651988 is an abundant number, since it is smaller than the sum of its proper divisors (3131537037612).

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

2109872651988 is a wasteful number, since it uses less digits than its factorization.

2109872651988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20749 (or 20747 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 66.

The spelling of 2109872651988 in words is "two trillion, one hundred nine billion, eight hundred seventy-two million, six hundred fifty-one thousand, nine hundred eighty-eight".