221221105 has 8 divisors (see below), whose sum is σ = 303388992. Its totient is φ = 151694448.

The previous prime is 221221097. The next prime is 221221127. The reversal of 221221105 is 501122122.

It is a happy number.

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 221221105 - 2³ = 221221097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3160267 + ... + 3160336.

It is an arithmetic number, because the mean of its divisors is an integer number (37923624).

Almost surely, 2^221221105 is an apocalyptic number.

It is an amenable number.

221221105 is a deficient number, since it is larger than the sum of its proper divisors (82167887).

221221105 is an equidigital number, since it uses as much as digits as its factorization.

221221105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6320615.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221221105 is about 14873.5034541294. The cubic root of 221221105 is about 604.7959196010.

Adding to 221221105 its reverse (501122122), we get a palindrome (722343227).

The spelling of 221221105 in words is "two hundred twenty-one million, two hundred twenty-one thousand, one hundred five".