231301203203221 has 2 divisors, whose sum is σ = 231301203203222. Its totient is φ = 231301203203220.

The previous prime is 231301203203167. The next prime is 231301203203227. The reversal of 231301203203221 is 122302302103132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180147023796996 + 51154179406225 = 13421886^2 + 7152215^2 .

It is a cyclic number.

It is not a de Polignac number, because 231301203203221 - 2⁷ = 231301203203093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231301203203227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115650601601610 + 115650601601611.

It is an arithmetic number, because the mean of its divisors is an integer number (115650601601611).

Almost surely, 2^{231301203203221} is an apocalyptic number.

It is an amenable number.

231301203203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

231301203203221 is an equidigital number, since it uses as much as digits as its factorization.

231301203203221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 231301203203221 its reverse (122302302103132), we get a palindrome (353603505306353).

The spelling of 231301203203221 in words is "two hundred thirty-one trillion, three hundred one billion, two hundred three million, two hundred three thousand, two hundred twenty-one".