21171650105 has 32 divisors (see below), whose sum is σ = 26717257728. Its totient is φ = 16085764800.

The previous prime is 21171650063. The next prime is 21171650113. The reversal of 21171650105 is 50105617112.

It is not a de Polignac number, because 21171650105 - 2¹² = 21171646009 is a prime.

It is a super-2 number, since 2×21171650105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2449802 + ... + 2458428.

It is an arithmetic number, because the mean of its divisors is an integer number (834914304).

Almost surely, 2^21171650105 is an apocalyptic number.

It is an amenable number.

21171650105 is a deficient number, since it is larger than the sum of its proper divisors (5545607623).

21171650105 is a wasteful number, since it uses less digits than its factorization.

21171650105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8957.

The product of its (nonzero) digits is 2100, while the sum is 29.

The spelling of 21171650105 in words is "twenty-one billion, one hundred seventy-one million, six hundred fifty thousand, one hundred five".