231021312001121 has 2 divisors, whose sum is σ = 231021312001122. Its totient is φ = 231021312001120.

The previous prime is 231021312001111. The next prime is 231021312001141. The reversal of 231021312001121 is 121100213120132.

It is an a-pointer prime, because the next prime (231021312001141) can be obtained adding 231021312001121 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186410935191121 + 44610376810000 = 13653239^2 + 6679100^2 .

It is a cyclic number.

It is not a de Polignac number, because 231021312001121 - 2⁴⁶ = 160652567823457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231021312001093 and 231021312001102.

It is not a weakly prime, because it can be changed into another prime (231021312001111) 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, 115510656000560 + 115510656000561.

It is an arithmetic number, because the mean of its divisors is an integer number (115510656000561).

Almost surely, 2^{231021312001121} is an apocalyptic number.

It is an amenable number.

231021312001121 is a deficient number, since it is larger than the sum of its proper divisors (1).

231021312001121 is an equidigital number, since it uses as much as digits as its factorization.

231021312001121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 231021312001121 its reverse (121100213120132), we get a palindrome (352121525121253).

The spelling of 231021312001121 in words is "two hundred thirty-one trillion, twenty-one billion, three hundred twelve million, one thousand, one hundred twenty-one".