1321404520231 has 2 divisors, whose sum is σ = 1321404520232. Its totient is φ = 1321404520230.

The previous prime is 1321404520223. The next prime is 1321404520259. The reversal of 1321404520231 is 1320254041231.

It is an a-pointer prime, because the next prime (1321404520259) can be obtained adding 1321404520231 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321404520231 - 2³ = 1321404520223 is a prime.

It is a super-2 number, since 2×1321404520231² (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 1321404520231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321404520211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660702260115 + 660702260116.

It is an arithmetic number, because the mean of its divisors is an integer number (660702260116).

Almost surely, 2^{1321404520231} is an apocalyptic number.

1321404520231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321404520231 is an equidigital number, since it uses as much as digits as its factorization.

1321404520231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 1321404520231 its reverse (1320254041231), we get a palindrome (2641658561462).

The spelling of 1321404520231 in words is "one trillion, three hundred twenty-one billion, four hundred four million, five hundred twenty thousand, two hundred thirty-one".