1323213221 has 8 divisors (see below), whose sum is σ = 1457798688. Its totient is φ = 1191010000.

The previous prime is 1323213209. The next prime is 1323213233. The reversal of 1323213221 is 1223123231.

It is an interprime number because it is at equal distance from previous prime (1323213209) and next prime (1323213233).

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

It is a cyclic number.

It is not a de Polignac number, because 1323213221 - 2¹⁴ = 1323196837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323213193 and 1323213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323213271) 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, 594395 + ... + 596616.

It is an arithmetic number, because the mean of its divisors is an integer number (182224836).

Almost surely, 2^1323213221 is an apocalyptic number.

1323213221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1323213221 is a deficient number, since it is larger than the sum of its proper divisors (134585467).

1323213221 is a wasteful number, since it uses less digits than its factorization.

1323213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191123.

The product of its digits is 432, while the sum is 20.

The square root of 1323213221 is about 36375.9978694743. The cubic root of 1323213221 is about 1097.8506849578.

Adding to 1323213221 its reverse (1223123231), we get a palindrome (2546336452).

The spelling of 1323213221 in words is "one billion, three hundred twenty-three million, two hundred thirteen thousand, two hundred twenty-one".