2113172388 has 60 divisors (see below), whose sum is σ = 5545478400. Its totient is φ = 701684208.

The previous prime is 2113172371. The next prime is 2113172389. The reversal of 2113172388 is 8832713112.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (2113172389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 72813 + ... + 97611.

It is an arithmetic number, because the mean of its divisors is an integer number (92424640).

Almost surely, 2^2113172388 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 2113172388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2772739200).

2113172388 is an abundant number, since it is smaller than the sum of its proper divisors (3432306012).

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

2113172388 is a wasteful number, since it uses less digits than its factorization.

2113172388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25078 (or 25067 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 2113172388 is about 45969.2548123199. The cubic root of 2113172388 is about 1283.2510917931.

The spelling of 2113172388 in words is "two billion, one hundred thirteen million, one hundred seventy-two thousand, three hundred eighty-eight".