1323012221 has 2 divisors, whose sum is σ = 1323012222. Its totient is φ = 1323012220.

The previous prime is 1323012191. The next prime is 1323012227. The reversal of 1323012221 is 1222103231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1318706596 + 4305625 = 36314^2 + 2075^2 .

It is an emirp because it is prime and its reverse (1222103231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1323012221 - 2¹⁴ = 1322995837 is a prime.

It is a super-2 number, since 2×1323012221² = 3500722673830705682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1323012221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323012227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661506110 + 661506111.

It is an arithmetic number, because the mean of its divisors is an integer number (661506111).

Almost surely, 2^1323012221 is an apocalyptic number.

It is an amenable number.

1323012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323012221 is an equidigital number, since it uses as much as digits as its factorization.

1323012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1323012221 is about 36373.2349537404. The cubic root of 1323012221 is about 1097.7950932214.

Adding to 1323012221 its reverse (1222103231), we get a palindrome (2545115452).

The spelling of 1323012221 in words is "one billion, three hundred twenty-three million, twelve thousand, two hundred twenty-one".