21041434105 has 4 divisors (see below), whose sum is σ = 25249720932. Its totient is φ = 16833147280.

The previous prime is 21041434091. The next prime is 21041434121. The reversal of 21041434105 is 50143414012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7514115856 + 13527318249 = 86684^2 + 116307^2 .

It is not a de Polignac number, because 21041434105 - 2⁷ = 21041433977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21041434105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104143406 + ... + 2104143415.

It is an arithmetic number, because the mean of its divisors is an integer number (6312430233).

Almost surely, 2^21041434105 is an apocalyptic number.

It is an amenable number.

21041434105 is a deficient number, since it is larger than the sum of its proper divisors (4208286827).

21041434105 is an equidigital number, since it uses as much as digits as its factorization.

21041434105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208286826.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21041434105 its reverse (50143414012), we get a palindrome (71184848117).

The spelling of 21041434105 in words is "twenty-one billion, forty-one million, four hundred thirty-four thousand, one hundred five".