2109720168 has 128 divisors (see below), whose sum is σ = 6094896000. Its totient is φ = 684023616.

The previous prime is 2109720167. The next prime is 2109720209. The reversal of 2109720168 is 8610279012.

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 (2109720163) 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, 645723 + ... + 648981.

It is an arithmetic number, because the mean of its divisors is an integer number (47616375).

Almost surely, 2^2109720168 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 2109720168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3047448000).

2109720168 is an abundant number, since it is smaller than the sum of its proper divisors (3985175832).

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

2109720168 is an equidigital number, since it uses as much as digits as its factorization.

2109720168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323 (or 3301 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 2109720168 is about 45931.6902366982. The cubic root of 2109720168 is about 1282.5519092563.

The spelling of 2109720168 in words is "two billion, one hundred nine million, seven hundred twenty thousand, one hundred sixty-eight".