2101360561 has 4 divisors (see below), whose sum is σ = 2173821300. Its totient is φ = 2028899824.

The previous prime is 2101360529. The next prime is 2101360603. The reversal of 2101360561 is 1650631012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 878529600 + 1222830961 = 29640^2 + 34969^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101360561 - 2⁵ = 2101360529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101360501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36230326 + ... + 36230383.

It is an arithmetic number, because the mean of its divisors is an integer number (543455325).

Almost surely, 2^2101360561 is an apocalyptic number.

It is an amenable number.

2101360561 is a deficient number, since it is larger than the sum of its proper divisors (72460739).

2101360561 is an equidigital number, since it uses as much as digits as its factorization.

2101360561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72460738.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2101360561 is about 45840.5994834274. The cubic root of 2101360561 is about 1280.8556618022.

Adding to 2101360561 its reverse (1650631012), we get a palindrome (3751991573).

The spelling of 2101360561 in words is "two billion, one hundred one million, three hundred sixty thousand, five hundred sixty-one".