231320132221 has 2 divisors, whose sum is σ = 231320132222. Its totient is φ = 231320132220.

The previous prime is 231320132203. The next prime is 231320132233. The reversal of 231320132221 is 122231023132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200278625625 + 31041506596 = 447525^2 + 176186^2 .

It is a cyclic number.

It is not a de Polignac number, because 231320132221 - 2⁹ = 231320131709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231320132192 and 231320132201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231320132261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115660066110 + 115660066111.

It is an arithmetic number, because the mean of its divisors is an integer number (115660066111).

Almost surely, 2^231320132221 is an apocalyptic number.

It is an amenable number.

231320132221 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320132221 is an equidigital number, since it uses as much as digits as its factorization.

231320132221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 231320132221 its reverse (122231023132), we get a palindrome (353551155353).

The spelling of 231320132221 in words is "two hundred thirty-one billion, three hundred twenty million, one hundred thirty-two thousand, two hundred twenty-one".