21526838105 has 4 divisors (see below), whose sum is σ = 25832205732. Its totient is φ = 17221470480.

The previous prime is 21526838051. The next prime is 21526838107. The reversal of 21526838105 is 50183862512.

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 5877828889 + 15649009216 = 76667^2 + 125096^2 .

It is not a de Polignac number, because 21526838105 - 2¹⁶ = 21526772569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21526838107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152683806 + ... + 2152683815.

It is an arithmetic number, because the mean of its divisors is an integer number (6458051433).

Almost surely, 2^21526838105 is an apocalyptic number.

It is an amenable number.

21526838105 is a deficient number, since it is larger than the sum of its proper divisors (4305367627).

21526838105 is an equidigital number, since it uses as much as digits as its factorization.

21526838105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4305367626.

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 21526838105 in words is "twenty-one billion, five hundred twenty-six million, eight hundred thirty-eight thousand, one hundred five".