221030111 has 4 divisors (see below), whose sum is σ = 221113152. Its totient is φ = 220947072.

The previous prime is 221030101. The next prime is 221030129. The reversal of 221030111 is 111030122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221030111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221030092 and 221030101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221030101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37391 + ... + 42896.

It is an arithmetic number, because the mean of its divisors is an integer number (55278288).

Almost surely, 2^221030111 is an apocalyptic number.

221030111 is a deficient number, since it is larger than the sum of its proper divisors (83041).

221030111 is an equidigital number, since it uses as much as digits as its factorization.

221030111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83040.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 221030111 is about 14867.0814553496. The cubic root of 221030111 is about 604.6218167868.

Adding to 221030111 its sum of digits (11), we get a palindrome (221030122).

Adding to 221030111 its reverse (111030122), we get a palindrome (332060233).

The spelling of 221030111 in words is "two hundred twenty-one million, thirty thousand, one hundred eleven".