1321238321231 has 2 divisors, whose sum is σ = 1321238321232. Its totient is φ = 1321238321230.

The previous prime is 1321238321197. The next prime is 1321238321317.

1321238321231 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1321238321231 - 2¹⁸ = 1321238059087 is a prime.

It is a super-2 number, since 2×1321238321231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321238321731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660619160615 + 660619160616.

It is an arithmetic number, because the mean of its divisors is an integer number (660619160616).

Almost surely, 2^{1321238321231} is an apocalyptic number.

1321238321231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321238321231 is an equidigital number, since it uses as much as digits as its factorization.

1321238321231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The spelling of 1321238321231 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-eight million, three hundred twenty-one thousand, two hundred thirty-one".