231232132212121 has 2 divisors, whose sum is σ = 231232132212122. Its totient is φ = 231232132212120.

The previous prime is 231232132212119. The next prime is 231232132212143. The reversal of 231232132212121 is 121212231232132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121408774659225 + 109823357552896 = 11018565^2 + 10479664^2 .

It is a cyclic number.

It is not a de Polignac number, because 231232132212121 - 2¹ = 231232132212119 is a prime.

Together with 231232132212119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 231232132212121.

It is not a weakly prime, because it can be changed into another prime (231232132212721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115616066106060 + 115616066106061.

It is an arithmetic number, because the mean of its divisors is an integer number (115616066106061).

Almost surely, 2^{231232132212121} is an apocalyptic number.

It is an amenable number.

231232132212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

231232132212121 is an equidigital number, since it uses as much as digits as its factorization.

231232132212121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

Adding to 231232132212121 its reverse (121212231232132), we get a palindrome (352444363444253).

The spelling of 231232132212121 in words is "two hundred thirty-one trillion, two hundred thirty-two billion, one hundred thirty-two million, two hundred twelve thousand, one hundred twenty-one".