203120131121 has 2 divisors, whose sum is σ = 203120131122. Its totient is φ = 203120131120.

The previous prime is 203120131111. The next prime is 203120131147. The reversal of 203120131121 is 121131021302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144524666896 + 58595464225 = 380164^2 + 242065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203120131121 is a prime.

It is a super-2 number, since 2×203120131121² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 203120131121.

It is not a weakly prime, because it can be changed into another prime (203120131111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101560065560 + 101560065561.

It is an arithmetic number, because the mean of its divisors is an integer number (101560065561).

Almost surely, 2^203120131121 is an apocalyptic number.

It is an amenable number.

203120131121 is a deficient number, since it is larger than the sum of its proper divisors (1).

203120131121 is an equidigital number, since it uses as much as digits as its factorization.

203120131121 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 203120131121 its reverse (121131021302), we get a palindrome (324251152423).

The spelling of 203120131121 in words is "two hundred three billion, one hundred twenty million, one hundred thirty-one thousand, one hundred twenty-one".