2105511707 has 4 divisors (see below), whose sum is σ = 2267474160. Its totient is φ = 1943549256.

The previous prime is 2105511697. The next prime is 2105511721. The reversal of 2105511707 is 7071155012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2105511707 - 2¹² = 2105507611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2105511707.

It is not an unprimeable number, because it can be changed into a prime (2105511757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80981207 + ... + 80981232.

It is an arithmetic number, because the mean of its divisors is an integer number (566868540).

Almost surely, 2^2105511707 is an apocalyptic number.

2105511707 is a deficient number, since it is larger than the sum of its proper divisors (161962453).

2105511707 is a wasteful number, since it uses less digits than its factorization.

2105511707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161962452.

The product of its (nonzero) digits is 2450, while the sum is 29.

The square root of 2105511707 is about 45885.8551952560. The cubic root of 2105511707 is about 1281.6985318318.

Adding to 2105511707 its reverse (7071155012), we get a palindrome (9176666719).

The spelling of 2105511707 in words is "two billion, one hundred five million, five hundred eleven thousand, seven hundred seven".