221221103 has 4 divisors (see below), whose sum is σ = 221301288. Its totient is φ = 221140920.

The previous prime is 221221097. The next prime is 221221127. The reversal of 221221103 is 301122122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 221221103 - 2⁴ = 221221087 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 (221221603) 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, 35801 + ... + 41522.

It is an arithmetic number, because the mean of its divisors is an integer number (55325322).

Almost surely, 2^221221103 is an apocalyptic number.

221221103 is a deficient number, since it is larger than the sum of its proper divisors (80185).

221221103 is an equidigital number, since it uses as much as digits as its factorization.

221221103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80184.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221221103 is about 14873.5033868958. The cubic root of 221221103 is about 604.7959177784.

Adding to 221221103 its reverse (301122122), we get a palindrome (522343225).

The spelling of 221221103 in words is "two hundred twenty-one million, two hundred twenty-one thousand, one hundred three".