2101170561 has 8 divisors (see below), whose sum is σ = 3201783744. Its totient is φ = 1200668880.

The previous prime is 2101170529. The next prime is 2101170581. The reversal of 2101170561 is 1650711012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101170561 - 2⁵ = 2101170529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101170581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50027850 + ... + 50027891.

It is an arithmetic number, because the mean of its divisors is an integer number (400222968).

Almost surely, 2^2101170561 is an apocalyptic number.

2101170561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2101170561 is a deficient number, since it is larger than the sum of its proper divisors (1100613183).

2101170561 is a wasteful number, since it uses less digits than its factorization.

2101170561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100055751.

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 2101170561 is about 45838.5270378532. The cubic root of 2101170561 is about 1280.8170566694.

Adding to 2101170561 its reverse (1650711012), we get a palindrome (3751881573).

The spelling of 2101170561 in words is "two billion, one hundred one million, one hundred seventy thousand, five hundred sixty-one".