221102012221 has 2 divisors, whose sum is σ = 221102012222. Its totient is φ = 221102012220.

The previous prime is 221102012207. The next prime is 221102012239. The reversal of 221102012221 is 122210201122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173171667321 + 47930344900 = 416139^2 + 218930^2 .

It is a cyclic number.

It is not a de Polignac number, because 221102012221 - 2⁷ = 221102012093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221102012195 and 221102012204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221102012321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551006110 + 110551006111.

It is an arithmetic number, because the mean of its divisors is an integer number (110551006111).

Almost surely, 2^221102012221 is an apocalyptic number.

It is an amenable number.

221102012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221102012221 is an equidigital number, since it uses as much as digits as its factorization.

221102012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221102012221 its reverse (122210201122), we get a palindrome (343312213343).

The spelling of 221102012221 in words is "two hundred twenty-one billion, one hundred two million, twelve thousand, two hundred twenty-one".