221221305233 has 2 divisors, whose sum is σ = 221221305234. Its totient is φ = 221221305232.

The previous prime is 221221305199. The next prime is 221221305241. The reversal of 221221305233 is 332503122122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149700895744 + 71520409489 = 386912^2 + 267433^2 .

It is a cyclic number.

It is not a de Polignac number, because 221221305233 - 2⁶ = 221221305169 is a prime.

It is not a weakly prime, because it can be changed into another prime (221221305293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610652616 + 110610652617.

It is an arithmetic number, because the mean of its divisors is an integer number (110610652617).

Almost surely, 2^221221305233 is an apocalyptic number.

It is an amenable number.

221221305233 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221305233 is an equidigital number, since it uses as much as digits as its factorization.

221221305233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 221221305233 its reverse (332503122122), we get a palindrome (553724427355).

The spelling of 221221305233 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred five thousand, two hundred thirty-three".