221305134 has 8 divisors (see below), whose sum is σ = 442610280. Its totient is φ = 73768376.

The previous prime is 221305129. The next prime is 221305163. The reversal of 221305134 is 431503122.

221305134 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

221305134 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 221305134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18442089 + ... + 18442100.

It is an arithmetic number, because the mean of its divisors is an integer number (55326285).

Almost surely, 2^221305134 is an apocalyptic number.

221305134 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221305134 is a wasteful number, since it uses less digits than its factorization.

221305134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36884194.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 221305134 is about 14876.3279743356. The cubic root of 221305134 is about 604.8724854771.

Adding to 221305134 its reverse (431503122), we get a palindrome (652808256).

The spelling of 221305134 in words is "two hundred twenty-one million, three hundred five thousand, one hundred thirty-four".