2105121051005 has 16 divisors (see below), whose sum is σ = 2899630254720. Its totient is φ = 1437208028352.

The previous prime is 2105121050947. The next prime is 2105121051041. The reversal of 2105121051005 is 5001501215012.

It is a cyclic number.

It is not a de Polignac number, because 2105121051005 - 2¹² = 2105121046909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131315819 + ... + 131331848.

It is an arithmetic number, because the mean of its divisors is an integer number (181226890920).

Almost surely, 2^{2105121051005} is an apocalyptic number.

It is an amenable number.

2105121051005 is a deficient number, since it is larger than the sum of its proper divisors (794509203715).

2105121051005 is a wasteful number, since it uses less digits than its factorization.

2105121051005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262647908.

The product of its (nonzero) digits is 500, while the sum is 23.

Adding to 2105121051005 its reverse (5001501215012), we get a palindrome (7106622266017).

The spelling of 2105121051005 in words is "two trillion, one hundred five billion, one hundred twenty-one million, fifty-one thousand, five".