1323004441021 has 2 divisors, whose sum is σ = 1323004441022. Its totient is φ = 1323004441020.

The previous prime is 1323004441019. The next prime is 1323004441049. The reversal of 1323004441021 is 1201444003231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1320775562500 + 2228878521 = 1149250^2 + 47211^2 .

It is an emirp because it is prime and its reverse (1201444003231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1323004441021 - 2¹ = 1323004441019 is a prime.

It is a super-2 number, since 2×1323004441021² (a number of 25 digits) contains 22 as substring.

Together with 1323004441019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323004442021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661502220510 + 661502220511.

It is an arithmetic number, because the mean of its divisors is an integer number (661502220511).

Almost surely, 2^{1323004441021} is an apocalyptic number.

It is an amenable number.

1323004441021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323004441021 is an equidigital number, since it uses as much as digits as its factorization.

1323004441021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 1323004441021 its reverse (1201444003231), we get a palindrome (2524448444252).

The spelling of 1323004441021 in words is "one trillion, three hundred twenty-three billion, four million, four hundred forty-one thousand, twenty-one".