2105521043 has 32 divisors (see below), whose sum is σ = 2388709440. Its totient is φ = 1844121600.

The previous prime is 2105521037. The next prime is 2105521109. The reversal of 2105521043 is 3401255012.

It is a cyclic number.

It is not a de Polignac number, because 2105521043 - 2⁶ = 2105520979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2105521013) 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, 7601021 + ... + 7601297.

It is an arithmetic number, because the mean of its divisors is an integer number (74647170).

Almost surely, 2^2105521043 is an apocalyptic number.

2105521043 is a deficient number, since it is larger than the sum of its proper divisors (283188397).

2105521043 is a wasteful number, since it uses less digits than its factorization.

2105521043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647.

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

The square root of 2105521043 is about 45885.9569258395. The cubic root of 2105521043 is about 1281.7004262122.

Adding to 2105521043 its reverse (3401255012), we get a palindrome (5506776055).

The spelling of 2105521043 in words is "two billion, one hundred five million, five hundred twenty-one thousand, forty-three".