2101720 has 16 divisors (see below), whose sum is σ = 4728960. Its totient is φ = 840672.

The previous prime is 2101703. The next prime is 2101721. The reversal of 2101720 is 271012.

2101720 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2101720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26232 + ... + 26311.

It is an arithmetic number, because the mean of its divisors is an integer number (295560).

2^2101720 is an apocalyptic number.

2101720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101720 is an abundant number, since it is smaller than the sum of its proper divisors (2627240).

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

2101720 is a wasteful number, since it uses less digits than its factorization.

2101720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52554 (or 52550 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 2101720 is about 1449.7310095325. The cubic root of 2101720 is about 128.0928688018.

Adding to 2101720 its reverse (271012), we get a palindrome (2372732).

The spelling of 2101720 in words is "two million, one hundred one thousand, seven hundred twenty".