2100565720 has 64 divisors (see below), whose sum is σ = 5171869440. Its totient is φ = 761481600.

The previous prime is 2100565711. The next prime is 2100565723. The reversal of 2100565720 is 275650012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100565723) 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, 138429 + ... + 152851.

It is an arithmetic number, because the mean of its divisors is an integer number (80810460).

Almost surely, 2^2100565720 is an apocalyptic number.

2100565720 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 2100565720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2585934720).

2100565720 is an abundant number, since it is smaller than the sum of its proper divisors (3071303720).

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

2100565720 is a wasteful number, since it uses less digits than its factorization.

2100565720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14776 (or 14772 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 2100565720 is about 45831.9290451537. The cubic root of 2100565720 is about 1280.6941466068.

The spelling of 2100565720 in words is "two billion, one hundred million, five hundred sixty-five thousand, seven hundred twenty".