21170217110 has 64 divisors (see below), whose sum is σ = 45170593920. Its totient is φ = 6992179200.

The previous prime is 21170217091. The next prime is 21170217137. The reversal of 21170217110 is 1171207112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221126 + ... + 302054.

It is an arithmetic number, because the mean of its divisors is an integer number (705790530).

Almost surely, 2^21170217110 is an apocalyptic number.

21170217110 is an abundant number, since it is smaller than the sum of its proper divisors (24000376810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21170217110 is a wasteful number, since it uses less digits than its factorization.

21170217110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81081.

The product of its (nonzero) digits is 196, while the sum is 23.

The spelling of 21170217110 in words is "twenty-one billion, one hundred seventy million, two hundred seventeen thousand, one hundred ten".