1323323021 has 2 divisors, whose sum is σ = 1323323022. Its totient is φ = 1323323020.

The previous prime is 1323322991. The next prime is 1323323137. The reversal of 1323323021 is 1203233231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1322776900 + 546121 = 36370^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323323021 - 2²² = 1319128717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1323322984 and 1323323002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323325021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661661510 + 661661511.

It is an arithmetic number, because the mean of its divisors is an integer number (661661511).

Almost surely, 2^1323323021 is an apocalyptic number.

It is an amenable number.

1323323021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323323021 is an equidigital number, since it uses as much as digits as its factorization.

1323323021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 1323323021 is about 36377.5070751144. The cubic root of 1323323021 is about 1097.8810506034.

Adding to 1323323021 its reverse (1203233231), we get a palindrome (2526556252).

The spelling of 1323323021 in words is "one billion, three hundred twenty-three million, three hundred twenty-three thousand, twenty-one".