221789913 has 8 divisors (see below), whose sum is σ = 295865376. Its totient is φ = 147787200.

The previous prime is 221789891. The next prime is 221789917. The reversal of 221789913 is 319987122.

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

It is not a de Polignac number, because 221789913 - 2⁵ = 221789881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221789917) 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, 10623 + ... + 23588.

It is an arithmetic number, because the mean of its divisors is an integer number (36983172).

Almost surely, 2^221789913 is an apocalyptic number.

It is an amenable number.

221789913 is a deficient number, since it is larger than the sum of its proper divisors (74075463).

221789913 is a wasteful number, since it uses less digits than its factorization.

221789913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36375.

The product of its digits is 54432, while the sum is 42.

The square root of 221789913 is about 14892.6126989189. The cubic root of 221789913 is about 605.3138303037.

The spelling of 221789913 in words is "two hundred twenty-one million, seven hundred eighty-nine thousand, nine hundred thirteen".