2105534510021 has 16 divisors (see below), whose sum is σ = 2119344360000. Its totient is φ = 2091769505280.

The previous prime is 2105534510017. The next prime is 2105534510063. The reversal of 2105534510021 is 1200154355012.

It is a cyclic number.

It is not a de Polignac number, because 2105534510021 - 2² = 2105534510017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105534510011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229932575 + ... + 229941731.

It is an arithmetic number, because the mean of its divisors is an integer number (132459022500).

Almost surely, 2^{2105534510021} is an apocalyptic number.

It is an amenable number.

2105534510021 is a deficient number, since it is larger than the sum of its proper divisors (13809849979).

2105534510021 is a wasteful number, since it uses less digits than its factorization.

2105534510021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11444.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 2105534510021 its reverse (1200154355012), we get a palindrome (3305688865033).

The spelling of 2105534510021 in words is "two trillion, one hundred five billion, five hundred thirty-four million, five hundred ten thousand, twenty-one".