2101173685 has 16 divisors (see below), whose sum is σ = 2808998640. Its totient is φ = 1498129920.

The previous prime is 2101173647. The next prime is 2101173689. The reversal of 2101173685 is 5863711012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 291692241 + 1809481444 = 17079^2 + 42538^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2101173685 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2101173685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101173689) 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, 555456 + ... + 559225.

It is an arithmetic number, because the mean of its divisors is an integer number (175562415).

Almost surely, 2^2101173685 is an apocalyptic number.

It is an amenable number.

2101173685 is a deficient number, since it is larger than the sum of its proper divisors (707824955).

2101173685 is a wasteful number, since it uses less digits than its factorization.

2101173685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114728.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 2101173685 is about 45838.5611139791. The cubic root of 2101173685 is about 1280.8176914378.

Adding to 2101173685 its reverse (5863711012), we get a palindrome (7964884697).

The spelling of 2101173685 in words is "two billion, one hundred one million, one hundred seventy-three thousand, six hundred eighty-five".