2111512105 has 4 divisors (see below), whose sum is σ = 2533814532. Its totient is φ = 1689209680.

The previous prime is 2111512093. The next prime is 2111512111. The reversal of 2111512105 is 5012151112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 724471056 + 1387041049 = 26916^2 + 37243^2 .

It is not a de Polignac number, because 2111512105 - 2⁷ = 2111511977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211151206 + ... + 211151215.

It is an arithmetic number, because the mean of its divisors is an integer number (633453633).

Almost surely, 2^2111512105 is an apocalyptic number.

It is an amenable number.

2111512105 is a deficient number, since it is larger than the sum of its proper divisors (422302427).

2111512105 is an equidigital number, since it uses as much as digits as its factorization.

2111512105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422302426.

The product of its (nonzero) digits is 100, while the sum is 19.

The square root of 2111512105 is about 45951.1926395823. The cubic root of 2111512105 is about 1282.9149276749.

Adding to 2111512105 its reverse (5012151112), we get a palindrome (7123663217).

The spelling of 2111512105 in words is "two billion, one hundred eleven million, five hundred twelve thousand, one hundred five".