2100517205 has 8 divisors (see below), whose sum is σ = 2630212992. Its totient is φ = 1607352208.

The previous prime is 2100517187. The next prime is 2100517217. The reversal of 2100517205 is 5027150012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2100517205 - 2⁶ = 2100517141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9132569 + ... + 9132798.

It is an arithmetic number, because the mean of its divisors is an integer number (328776624).

Almost surely, 2^2100517205 is an apocalyptic number.

It is an amenable number.

2100517205 is a deficient number, since it is larger than the sum of its proper divisors (529695787).

2100517205 is a wasteful number, since it uses less digits than its factorization.

2100517205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18265395.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 2100517205 is about 45831.3997713358. The cubic root of 2100517205 is about 1280.6842868257.

Adding to 2100517205 its reverse (5027150012), we get a palindrome (7127667217).

The spelling of 2100517205 in words is "two billion, one hundred million, five hundred seventeen thousand, two hundred five".