2100720000 has 160 divisors (see below), whose sum is σ = 6973611480. Its totient is φ = 560128000.

The previous prime is 2100719983. The next prime is 2100720023. The reversal of 2100720000 is 270012.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 235624 + ... + 244376.

Almost surely, 2^2100720000 is an apocalyptic number.

2100720000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3486805740).

2100720000 is an abundant number, since it is smaller than the sum of its proper divisors (4872891480).

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

2100720000 is an frugal number, since it uses more digits than its factorization.

2100720000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8790 (or 8763 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 2100720000 is about 45833.6121203642. The cubic root of 2100720000 is about 1280.7255001693.

Adding to 2100720000 its reverse (270012), we get a palindrome (2100990012).

The spelling of 2100720000 in words is "two billion, one hundred million, seven hundred twenty thousand".