21171289910 has 32 divisors (see below), whose sum is σ = 38650590720. Its totient is φ = 8348133888.

The previous prime is 21171289907. The next prime is 21171289921. The reversal of 21171289910 is 1998217112.

It is a Curzon number.

It is a congruent number.

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, 1627994 + ... + 1640946.

It is an arithmetic number, because the mean of its divisors is an integer number (1207830960).

Almost surely, 2^21171289910 is an apocalyptic number.

21171289910 is a deficient number, since it is larger than the sum of its proper divisors (17479300810).

21171289910 is a wasteful number, since it uses less digits than its factorization.

21171289910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15272.

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 21171289910 in words is "twenty-one billion, one hundred seventy-one million, two hundred eighty-nine thousand, nine hundred ten".