1321031221231 has 2 divisors, whose sum is σ = 1321031221232. Its totient is φ = 1321031221230.

The previous prime is 1321031221217. The next prime is 1321031221241. The reversal of 1321031221231 is 1321221301231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321031221231 - 2²⁵ = 1320997666799 is a prime.

It is a super-2 number, since 2×1321031221231² (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 (1321031221241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660515610615 + 660515610616.

It is an arithmetic number, because the mean of its divisors is an integer number (660515610616).

Almost surely, 2^{1321031221231} is an apocalyptic number.

1321031221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321031221231 is an equidigital number, since it uses as much as digits as its factorization.

1321031221231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1321031221231 its reverse (1321221301231), we get a palindrome (2642252522462).

The spelling of 1321031221231 in words is "one trillion, three hundred twenty-one billion, thirty-one million, two hundred twenty-one thousand, two hundred thirty-one".