1223232221 has 2 divisors, whose sum is σ = 1223232222. Its totient is φ = 1223232220.

The previous prime is 1223232211. The next prime is 1223232251. The reversal of 1223232221 is 1222323221.

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., 1024704121 + 198528100 = 32011^2 + 14090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223232221 - 2¹⁴ = 1223215837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1223232193 and 1223232202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223232211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611616110 + 611616111.

It is an arithmetic number, because the mean of its divisors is an integer number (611616111).

Almost surely, 2^1223232221 is an apocalyptic number.

It is an amenable number.

1223232221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223232221 is an equidigital number, since it uses as much as digits as its factorization.

1223232221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 20.

The square root of 1223232221 is about 34974.7368967945. The cubic root of 1223232221 is about 1069.4725385258.

Adding to 1223232221 its reverse (1222323221), we get a palindrome (2445555442).

The spelling of 1223232221 in words is "one billion, two hundred twenty-three million, two hundred thirty-two thousand, two hundred twenty-one".