221244101 has 8 divisors (see below), whose sum is σ = 242759160. Its totient is φ = 200371392.

The previous prime is 221244097. The next prime is 221244173. The reversal of 221244101 is 101442122.

It can be written as a sum of positive squares in 4 ways, for example, as 13912900 + 207331201 = 3730^2 + 14399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221244101 - 2² = 221244097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221244101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221244601) 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 7 ways as a sum of consecutive naturals, for example, 159866 + ... + 161243.

It is an arithmetic number, because the mean of its divisors is an integer number (30344895).

Almost surely, 2^221244101 is an apocalyptic number.

It is an amenable number.

221244101 is a deficient number, since it is larger than the sum of its proper divisors (21515059).

221244101 is a wasteful number, since it uses less digits than its factorization.

221244101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321175.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 221244101 is about 14874.2764866060. The cubic root of 221244101 is about 604.8168751138.

Adding to 221244101 its reverse (101442122), we get a palindrome (322686223).

The spelling of 221244101 in words is "two hundred twenty-one million, two hundred forty-four thousand, one hundred one".