1100221 has 4 divisors (see below), whose sum is σ = 1135744. Its totient is φ = 1064700.

The previous prime is 1100219. The next prime is 1100243. The reversal of 1100221 is 1220011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1100221 - 2¹ = 1100219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17715 + ... + 17776.

It is an arithmetic number, because the mean of its divisors is an integer number (283936).

2^1100221 is an apocalyptic number.

It is an amenable number.

1100221 is a deficient number, since it is larger than the sum of its proper divisors (35523).

1100221 is an equidigital number, since it uses as much as digits as its factorization.

1100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35522.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1100221 is about 1048.9142004950. The cubic root of 1100221 is about 103.2349242314.

Adding to 1100221 its reverse (1220011), we get a palindrome (2320232).

The spelling of 1100221 in words is "one million, one hundred thousand, two hundred twenty-one".