2105534509991 has 32 divisors (see below), whose sum is σ = 2476270790400. Its totient is φ = 1769630042880.

The previous prime is 2105534509979. The next prime is 2105534510011. The reversal of 2105534509991 is 1999054355012.

It is a cyclic number.

It is not a de Polignac number, because 2105534509991 - 2⁶ = 2105534509927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105534509391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10042565 + ... + 10250081.

It is an arithmetic number, because the mean of its divisors is an integer number (77383462200).

Almost surely, 2^{2105534509991} is an apocalyptic number.

2105534509991 is a deficient number, since it is larger than the sum of its proper divisors (370736280409).

2105534509991 is a wasteful number, since it uses less digits than its factorization.

2105534509991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208719.

The product of its (nonzero) digits is 2187000, while the sum is 53.

The spelling of 2105534509991 in words is "two trillion, one hundred five billion, five hundred thirty-four million, five hundred nine thousand, nine hundred ninety-one".