221830111 has 8 divisors (see below), whose sum is σ = 234342000. Its totient is φ = 209401920.

The previous prime is 221830109. The next prime is 221830117. The reversal of 221830111 is 111038122.

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 221830111 - 2¹ = 221830109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221830117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15436 + ... + 26113.

It is an arithmetic number, because the mean of its divisors is an integer number (29292750).

Almost surely, 2^221830111 is an apocalyptic number.

221830111 is a deficient number, since it is larger than the sum of its proper divisors (12511889).

221830111 is a wasteful number, since it uses less digits than its factorization.

221830111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41849.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 221830111 is about 14893.9622330661. The cubic root of 221830111 is about 605.3503978451.

Adding to 221830111 its reverse (111038122), we get a palindrome (332868233).

The spelling of 221830111 in words is "two hundred twenty-one million, eight hundred thirty thousand, one hundred eleven".