221235203221 has 2 divisors, whose sum is σ = 221235203222. Its totient is φ = 221235203220.

The previous prime is 221235203209. The next prime is 221235203237. The reversal of 221235203221 is 122302532122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132139520100 + 89095683121 = 363510^2 + 298489^2 .

It is a cyclic number.

It is not a de Polignac number, because 221235203221 - 2⁷ = 221235203093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221235206221) 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 as a sum of consecutive naturals, namely, 110617601610 + 110617601611.

It is an arithmetic number, because the mean of its divisors is an integer number (110617601611).

Almost surely, 2^221235203221 is an apocalyptic number.

It is an amenable number.

221235203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221235203221 is an equidigital number, since it uses as much as digits as its factorization.

221235203221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 221235203221 its reverse (122302532122), we get a palindrome (343537735343).

The spelling of 221235203221 in words is "two hundred twenty-one billion, two hundred thirty-five million, two hundred three thousand, two hundred twenty-one".