231310210121 has 2 divisors, whose sum is σ = 231310210122. Its totient is φ = 231310210120.

The previous prime is 231310210067. The next prime is 231310210127. The reversal of 231310210121 is 121012013132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230625655225 + 684554896 = 480235^2 + 26164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231310210121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231310210121.

It is not a weakly prime, because it can be changed into another prime (231310210127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655105060 + 115655105061.

It is an arithmetic number, because the mean of its divisors is an integer number (115655105061).

Almost surely, 2^231310210121 is an apocalyptic number.

It is an amenable number.

231310210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

231310210121 is an equidigital number, since it uses as much as digits as its factorization.

231310210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 231310210121 its reverse (121012013132), we get a palindrome (352322223253).

The spelling of 231310210121 in words is "two hundred thirty-one billion, three hundred ten million, two hundred ten thousand, one hundred twenty-one".