2168305621720 has 64 divisors (see below), whose sum is σ = 5577201745920. Its totient is φ = 743211241344.

The previous prime is 2168305621697. The next prime is 2168305621723. The reversal of 2168305621720 is 271265038612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168305621723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77412 + ... + 2083891.

It is an arithmetic number, because the mean of its divisors is an integer number (87143777280).

Almost surely, 2^{2168305621720} is an apocalyptic number.

2168305621720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2168305621720 is an abundant number, since it is smaller than the sum of its proper divisors (3408896124200).

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

2168305621720 is a wasteful number, since it uses less digits than its factorization.

2168305621720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164904 (or 2164900 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 2168305621720 in words is "two trillion, one hundred sixty-eight billion, three hundred five million, six hundred twenty-one thousand, seven hundred twenty".