2105221523 has 16 divisors (see below), whose sum is σ = 2197746720. Its totient is φ = 2014730496.

The previous prime is 2105221513. The next prime is 2105221549. The reversal of 2105221523 is 3251225012.

It is a cyclic number.

It is not a de Polignac number, because 2105221523 - 2⁸ = 2105221267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2105221513) 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, 1260533 + ... + 1262201.

It is an arithmetic number, because the mean of its divisors is an integer number (137359170).

Almost surely, 2^2105221523 is an apocalyptic number.

2105221523 is a deficient number, since it is larger than the sum of its proper divisors (92525197).

2105221523 is a wasteful number, since it uses less digits than its factorization.

2105221523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2105221523 is about 45882.6930661224. The cubic root of 2105221523 is about 1281.6396474138.

Adding to 2105221523 its reverse (3251225012), we get a palindrome (5356446535).

The spelling of 2105221523 in words is "two billion, one hundred five million, two hundred twenty-one thousand, five hundred twenty-three".