1323221221 has 8 divisors (see below), whose sum is σ = 1544428800. Its totient is φ = 1110057648.

The previous prime is 1323221219. The next prime is 1323221239. The reversal of 1323221221 is 1221223231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1323221221 - 2¹ = 1323221219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2010646 + ... + 2011303.

It is an arithmetic number, because the mean of its divisors is an integer number (193053600).

Almost surely, 2^1323221221 is an apocalyptic number.

It is an amenable number.

1323221221 is a deficient number, since it is larger than the sum of its proper divisors (221207579).

1323221221 is an equidigital number, since it uses as much as digits as its factorization.

1323221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022003.

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

The square root of 1323221221 is about 36376.1078319273. The cubic root of 1323221221 is about 1097.8528974477.

Adding to 1323221221 its reverse (1221223231), we get a palindrome (2544444452).

It can be divided in two parts, 13232 and 21221, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 1323221221 in words is "one billion, three hundred twenty-three million, two hundred twenty-one thousand, two hundred twenty-one".