2105219709 has 6 divisors (see below), whose sum is σ = 3040872926. Its totient is φ = 1403479800.

The previous prime is 2105219593. The next prime is 2105219717. The reversal of 2105219709 is 9079125012.

It can be written as a sum of positive squares in only one way, i.e., 1368260100 + 736959609 = 36990^2 + 27147^2 .

It is not a de Polignac number, because 2105219709 - 2⁷ = 2105219581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105219749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116956642 + ... + 116956659.

Almost surely, 2^2105219709 is an apocalyptic number.

It is an amenable number.

2105219709 is a deficient number, since it is larger than the sum of its proper divisors (935653217).

2105219709 is a wasteful number, since it uses less digits than its factorization.

2105219709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233913307 (or 233913304 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 2105219709 is about 45882.6732983160. The cubic root of 2105219709 is about 1281.6392792981.

The spelling of 2105219709 in words is "two billion, one hundred five million, two hundred nineteen thousand, seven hundred nine".