1323220331231 has 2 divisors, whose sum is σ = 1323220331232. Its totient is φ = 1323220331230.

The previous prime is 1323220331221. The next prime is 1323220331239. The reversal of 1323220331231 is 1321330223231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1323220331231 is a prime.

It is a super-2 number, since 2×1323220331231² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1323220331231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323220331239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661610165615 + 661610165616.

It is an arithmetic number, because the mean of its divisors is an integer number (661610165616).

Almost surely, 2^{1323220331231} is an apocalyptic number.

1323220331231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323220331231 is an equidigital number, since it uses as much as digits as its factorization.

1323220331231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 1323220331231 its reverse (1321330223231), we get a palindrome (2644550554462).

The spelling of 1323220331231 in words is "one trillion, three hundred twenty-three billion, two hundred twenty million, three hundred thirty-one thousand, two hundred thirty-one".