1323423221 has 2 divisors, whose sum is σ = 1323423222. Its totient is φ = 1323423220.

The previous prime is 1323423217. The next prime is 1323423251. The reversal of 1323423221 is 1223243231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1082739025 + 240684196 = 32905^2 + 15514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323423221 - 2² = 1323423217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323423251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661711610 + 661711611.

It is an arithmetic number, because the mean of its divisors is an integer number (661711611).

Almost surely, 2^1323423221 is an apocalyptic number.

It is an amenable number.

1323423221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323423221 is an equidigital number, since it uses as much as digits as its factorization.

1323423221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 23.

The square root of 1323423221 is about 36378.8842737102. The cubic root of 1323423221 is about 1097.9087598634.

Adding to 1323423221 its reverse (1223243231), we get a palindrome (2546666452).

The spelling of 1323423221 in words is "one billion, three hundred twenty-three million, four hundred twenty-three thousand, two hundred twenty-one".