1231224221321 has 2 divisors, whose sum is σ = 1231224221322. Its totient is φ = 1231224221320.

The previous prime is 1231224221251. The next prime is 1231224221323.

1231224221321 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 965031169600 + 266193051721 = 982360^2 + 515939^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231224221321 is a prime.

Together with 1231224221323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1231224221323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615612110660 + 615612110661.

It is an arithmetic number, because the mean of its divisors is an integer number (615612110661).

Almost surely, 2^{1231224221321} is an apocalyptic number.

It is an amenable number.

1231224221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231224221321 is an equidigital number, since it uses as much as digits as its factorization.

1231224221321 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1231224221321 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-four million, two hundred twenty-one thousand, three hundred twenty-one".