231021000121 has 2 divisors, whose sum is σ = 231021000122. Its totient is φ = 231021000120.

The previous prime is 231021000097. The next prime is 231021000127. The reversal of 231021000121 is 121000120132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163830657600 + 67190342521 = 404760^2 + 259211^2 .

It is a cyclic number.

It is not a de Polignac number, because 231021000121 - 2²⁹ = 230484129209 is a prime.

It is not a weakly prime, because it can be changed into another prime (231021000127) 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, 115510500060 + 115510500061.

It is an arithmetic number, because the mean of its divisors is an integer number (115510500061).

Almost surely, 2^231021000121 is an apocalyptic number.

It is an amenable number.

231021000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

231021000121 is an equidigital number, since it uses as much as digits as its factorization.

231021000121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 231021000121 its reverse (121000120132), we get a palindrome (352021120253).

The spelling of 231021000121 in words is "two hundred thirty-one billion, twenty-one million, one hundred twenty-one", and thus it is an aban number.