221244120221 has 12 divisors (see below), whose sum is σ = 235559528160. Its totient is φ = 207755313600.

The previous prime is 221244120217. The next prime is 221244120241. The reversal of 221244120221 is 122021442122.

It is not a de Polignac number, because 221244120221 - 2² = 221244120217 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 (221244120241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 745055 + ... + 998796.

It is an arithmetic number, because the mean of its divisors is an integer number (19629960680).

Almost surely, 2^221244120221 is an apocalyptic number.

It is an amenable number.

221244120221 is a deficient number, since it is larger than the sum of its proper divisors (14315407939).

221244120221 is a wasteful number, since it uses less digits than its factorization.

221244120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744324 (or 1744307 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221244120221 its reverse (122021442122), we get a palindrome (343265562343).

The spelling of 221244120221 in words is "two hundred twenty-one billion, two hundred forty-four million, one hundred twenty thousand, two hundred twenty-one".