1232231231221 has 2 divisors, whose sum is σ = 1232231231222. Its totient is φ = 1232231231220.

The previous prime is 1232231231191. The next prime is 1232231231243. The reversal of 1232231231221 is 1221321322321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 953183168721 + 279048062500 = 976311^2 + 528250^2 .

It is an emirp because it is prime and its reverse (1221321322321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1232231231221 - 2⁷ = 1232231231093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232231231291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616115615610 + 616115615611.

It is an arithmetic number, because the mean of its divisors is an integer number (616115615611).

Almost surely, 2^{1232231231221} is an apocalyptic number.

It is an amenable number.

1232231231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232231231221 is an equidigital number, since it uses as much as digits as its factorization.

1232231231221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

Adding to 1232231231221 its reverse (1221321322321), we get a palindrome (2453552553542).

The spelling of 1232231231221 in words is "one trillion, two hundred thirty-two billion, two hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty-one".