1223321221 has 2 divisors, whose sum is σ = 1223321222. Its totient is φ = 1223321220.

The previous prime is 1223321219. The next prime is 1223321237. The reversal of 1223321221 is 1221233221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1121513121 + 101808100 = 33489^2 + 10090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223321221 - 2¹ = 1223321219 is a prime.

Together with 1223321219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223321291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611660610 + 611660611.

It is an arithmetic number, because the mean of its divisors is an integer number (611660611).

Almost surely, 2^1223321221 is an apocalyptic number.

It is an amenable number.

1223321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223321221 is an equidigital number, since it uses as much as digits as its factorization.

1223321221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 1223321221 is about 34976.0092206072. The cubic root of 1223321221 is about 1069.4984754782.

Adding to 1223321221 its reverse (1221233221), we get a palindrome (2444554442).

The spelling of 1223321221 in words is "one billion, two hundred twenty-three million, three hundred twenty-one thousand, two hundred twenty-one".