1323331021 has 4 divisors (see below), whose sum is σ = 1329602944. Its totient is φ = 1317059100.

The previous prime is 1323330997. The next prime is 1323331027. The reversal of 1323331021 is 1201333231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1201333231 = 7 ⋅171619033.

It is a cyclic number.

It is not a de Polignac number, because 1323331021 - 2¹⁵ = 1323298253 is a prime.

It is a super-2 number, since 2×1323331021² = 3502409982281804882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1323331021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323331027) 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 3 ways as a sum of consecutive naturals, for example, 3135645 + ... + 3136066.

It is an arithmetic number, because the mean of its divisors is an integer number (332400736).

Almost surely, 2^1323331021 is an apocalyptic number.

It is an amenable number.

1323331021 is a deficient number, since it is larger than the sum of its proper divisors (6271923).

1323331021 is an equidigital number, since it uses as much as digits as its factorization.

1323331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6271922.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1323331021 is about 36377.6170330053. The cubic root of 1323331021 is about 1097.8832629710.

Adding to 1323331021 its reverse (1201333231), we get a palindrome (2524664252).

The spelling of 1323331021 in words is "one billion, three hundred twenty-three million, three hundred thirty-one thousand, twenty-one".