21104523305 has 16 divisors (see below), whose sum is σ = 25565687424. Its totient is φ = 16724083200.

The previous prime is 21104523283. The next prime is 21104523331. The reversal of 21104523305 is 50332540112.

It is a happy number.

It is not a de Polignac number, because 21104523305 - 2¹² = 21104519209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226922 + ... + 306108.

It is an arithmetic number, because the mean of its divisors is an integer number (1597855464).

Almost surely, 2^21104523305 is an apocalyptic number.

It is an amenable number.

21104523305 is a deficient number, since it is larger than the sum of its proper divisors (4461164119).

21104523305 is a wasteful number, since it uses less digits than its factorization.

21104523305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79696.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 21104523305 in words is "twenty-one billion, one hundred four million, five hundred twenty-three thousand, three hundred five".