10231131212221 has 2 divisors, whose sum is σ = 10231131212222. Its totient is φ = 10231131212220.

The previous prime is 10231131212189. The next prime is 10231131212329. The reversal of 10231131212221 is 12221213113201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5538444492100 + 4692686720121 = 2353390^2 + 2166261^2 .

It is a cyclic number.

It is not a de Polignac number, because 10231131212221 - 2⁵ = 10231131212189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10231131212192 and 10231131212201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10231131213221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5115565606110 + 5115565606111.

It is an arithmetic number, because the mean of its divisors is an integer number (5115565606111).

Almost surely, 2^{10231131212221} is an apocalyptic number.

It is an amenable number.

10231131212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10231131212221 is an equidigital number, since it uses as much as digits as its factorization.

10231131212221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 10231131212221 its reverse (12221213113201), we get a palindrome (22452344325422).

The spelling of 10231131212221 in words is "ten trillion, two hundred thirty-one billion, one hundred thirty-one million, two hundred twelve thousand, two hundred twenty-one".