21171552105 has 48 divisors (see below), whose sum is σ = 37789883712. Its totient is φ = 10111728000.

The previous prime is 21171552041. The next prime is 21171552119. The reversal of 21171552105 is 50125517112.

It is not a de Polignac number, because 21171552105 - 2⁶ = 21171552041 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34555 + ... + 208655.

It is an arithmetic number, because the mean of its divisors is an integer number (787289244).

Almost surely, 2^21171552105 is an apocalyptic number.

It is an amenable number.

21171552105 is a deficient number, since it is larger than the sum of its proper divisors (16618331607).

21171552105 is a wasteful number, since it uses less digits than its factorization.

21171552105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174198 (or 174187 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 30.

The spelling of 21171552105 in words is "twenty-one billion, one hundred seventy-one million, five hundred fifty-two thousand, one hundred five".