231222303222221 has 16 divisors (see below), whose sum is σ = 235650562095024. Its totient is φ = 226796482558464.

The previous prime is 231222303222217. The next prime is 231222303222259. The reversal of 231222303222221 is 122222303222132.

It can be written as a sum of positive squares in 8 ways, for example, as 5997547122121 + 225224756100100 = 2448989^2 + 15007490^2 .

It is a cyclic number.

It is not a de Polignac number, because 231222303222221 - 2² = 231222303222217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231222303227221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3014711945 + ... + 3014788641.

It is an arithmetic number, because the mean of its divisors is an integer number (14728160130939).

Almost surely, 2^{231222303222221} is an apocalyptic number.

It is an amenable number.

231222303222221 is a deficient number, since it is larger than the sum of its proper divisors (4428258872803).

231222303222221 is an equidigital number, since it uses as much as digits as its factorization.

231222303222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91840.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 231222303222221 its reverse (122222303222132), we get a palindrome (353444606444353).

The spelling of 231222303222221 in words is "two hundred thirty-one trillion, two hundred twenty-two billion, three hundred three million, two hundred twenty-two thousand, two hundred twenty-one".