1323221 has 2 divisors, whose sum is σ = 1323222. Its totient is φ = 1323220.

The previous prime is 1323199. The next prime is 1323233. The reversal of 1323221 is 1223231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 790321 + 532900 = 889^2 + 730^2 .

It is an emirp because it is prime and its reverse (1223231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1323221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1323196 and 1323205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661610 + 661611.

It is an arithmetic number, because the mean of its divisors is an integer number (661611).

2^1323221 is an apocalyptic number.

It is an amenable number.

1323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323221 is an equidigital number, since it uses as much as digits as its factorization.

1323221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 14.

The square root of 1323221 is about 1150.3134355470. The cubic root of 1323221 is about 109.7852836328.

Adding to 1323221 its reverse (1223231), we get a palindrome (2546452).

The spelling of 1323221 in words is "one million, three hundred twenty-three thousand, two hundred twenty-one".