203311210121 has 2 divisors, whose sum is σ = 203311210122. Its totient is φ = 203311210120.

The previous prime is 203311210117. The next prime is 203311210139. The reversal of 203311210121 is 121012113302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123102739600 + 80208470521 = 350860^2 + 283211^2 .

It is a cyclic number.

It is not a de Polignac number, because 203311210121 - 2² = 203311210117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203311210121.

It is not a weakly prime, because it can be changed into another prime (203311200121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101655605060 + 101655605061.

It is an arithmetic number, because the mean of its divisors is an integer number (101655605061).

Almost surely, 2^203311210121 is an apocalyptic number.

It is an amenable number.

203311210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

203311210121 is an equidigital number, since it uses as much as digits as its factorization.

203311210121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 203311210121 its reverse (121012113302), we get a palindrome (324323323423).

The spelling of 203311210121 in words is "two hundred three billion, three hundred eleven million, two hundred ten thousand, one hundred twenty-one".