21322100505 has 16 divisors (see below), whose sum is σ = 35291753280. Its totient is φ = 10979656128.

The previous prime is 21322100497. The next prime is 21322100521. The reversal of 21322100505 is 50500122312.

It is not a de Polignac number, because 21322100505 - 2³ = 21322100497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24507727 + ... + 24508596.

It is an arithmetic number, because the mean of its divisors is an integer number (2205734580).

Almost surely, 2^21322100505 is an apocalyptic number.

It is an amenable number.

21322100505 is a deficient number, since it is larger than the sum of its proper divisors (13969652775).

21322100505 is a wasteful number, since it uses less digits than its factorization.

21322100505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49016360.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 21322100505 its reverse (50500122312), we get a palindrome (71822222817).

The spelling of 21322100505 in words is "twenty-one billion, three hundred twenty-two million, one hundred thousand, five hundred five".