221173064 has 96 divisors (see below), whose sum is σ = 501098400. Its totient is φ = 91203840.

The previous prime is 221173063. The next prime is 221173109. The reversal of 221173064 is 460371122.

221173064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221173063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1688279 + ... + 1688409.

It is an arithmetic number, because the mean of its divisors is an integer number (5219775).

Almost surely, 2^221173064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221173064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250549200).

221173064 is an abundant number, since it is smaller than the sum of its proper divisors (279925336).

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

221173064 is a wasteful number, since it uses less digits than its factorization.

221173064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 221173064 is about 14871.8883804310. Note that the first 3 decimals coincide. The cubic root of 221173064 is about 604.7521367015.

The spelling of 221173064 in words is "two hundred twenty-one million, one hundred seventy-three thousand, sixty-four".