2105605217 has 8 divisors (see below), whose sum is σ = 2158071552. Its totient is φ = 2053458400.

The previous prime is 2105605199. The next prime is 2105605223. The reversal of 2105605217 is 7125065012.

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 2105605217 - 2⁶ = 2105605153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2105605217.

It is not an unprimeable number, because it can be changed into a prime (2105605247) 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, 66509 + ... + 92922.

It is an arithmetic number, because the mean of its divisors is an integer number (269758944).

Almost surely, 2^2105605217 is an apocalyptic number.

It is an amenable number.

2105605217 is a deficient number, since it is larger than the sum of its proper divisors (52466335).

2105605217 is a wasteful number, since it uses less digits than its factorization.

2105605217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159759.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 2105605217 is about 45886.8741253967. The cubic root of 2105605217 is about 1281.7175058189.

The spelling of 2105605217 in words is "two billion, one hundred five million, six hundred five thousand, two hundred seventeen".