1321240421231 has 2 divisors, whose sum is σ = 1321240421232. Its totient is φ = 1321240421230.

The previous prime is 1321240421227. The next prime is 1321240421233.

It is a happy number.

1321240421231 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1321240421231 - 2² = 1321240421227 is a prime.

It is a super-2 number, since 2×1321240421231² (a number of 25 digits) contains 22 as substring.

Together with 1321240421233, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321240421231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321240421233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660620210615 + 660620210616.

It is an arithmetic number, because the mean of its divisors is an integer number (660620210616).

Almost surely, 2^{1321240421231} is an apocalyptic number.

1321240421231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321240421231 is an equidigital number, since it uses as much as digits as its factorization.

1321240421231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

It can be divided in two parts, 1321240 and 421231, that added together give a palindrome (1742471).

The spelling of 1321240421231 in words is "one trillion, three hundred twenty-one billion, two hundred forty million, four hundred twenty-one thousand, two hundred thirty-one".