21116525173 has 8 divisors (see below), whose sum is σ = 21425875200. Its totient is φ = 20808226608.

The previous prime is 21116525167. The next prime is 21116525191. The reversal of 21116525173 is 37152561112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21116525173 - 2⁵ = 21116525141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116525473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222361 + ... + 302782.

It is an arithmetic number, because the mean of its divisors is an integer number (2678234400).

Almost surely, 2^21116525173 is an apocalyptic number.

It is an amenable number.

21116525173 is a deficient number, since it is larger than the sum of its proper divisors (309350027).

21116525173 is an equidigital number, since it uses as much as digits as its factorization.

21116525173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525731.

The product of its digits is 12600, while the sum is 34.

The spelling of 21116525173 in words is "twenty-one billion, one hundred sixteen million, five hundred twenty-five thousand, one hundred seventy-three".