21650366105 has 4 divisors (see below), whose sum is σ = 25980439332. Its totient is φ = 17320292880.

The previous prime is 21650366083. The next prime is 21650366113. The reversal of 21650366105 is 50166305612.

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 2565219904 + 19085146201 = 50648^2 + 138149^2 .

It is not a de Polignac number, because 21650366105 - 2³⁰ = 20576624281 is a prime.

It is a Duffinian number.

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, 2165036606 + ... + 2165036615.

It is an arithmetic number, because the mean of its divisors is an integer number (6495109833).

Almost surely, 2^21650366105 is an apocalyptic number.

It is an amenable number.

21650366105 is a deficient number, since it is larger than the sum of its proper divisors (4330073227).

21650366105 is an equidigital number, since it uses as much as digits as its factorization.

21650366105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4330073226.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 21650366105 in words is "twenty-one billion, six hundred fifty million, three hundred sixty-six thousand, one hundred five".