203125020121 has 2 divisors, whose sum is σ = 203125020122. Its totient is φ = 203125020120.

The previous prime is 203125020071. The next prime is 203125020157. The reversal of 203125020121 is 121020521302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185902394896 + 17222625225 = 431164^2 + 131235^2 .

It is a cyclic number.

It is not a de Polignac number, because 203125020121 - 2¹⁷ = 203124889049 is a prime.

It is not a weakly prime, because it can be changed into another prime (203125020221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101562510060 + 101562510061.

It is an arithmetic number, because the mean of its divisors is an integer number (101562510061).

Almost surely, 2^203125020121 is an apocalyptic number.

It is an amenable number.

203125020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

203125020121 is an equidigital number, since it uses as much as digits as its factorization.

203125020121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 203125020121 its reverse (121020521302), we get a palindrome (324145541423).

The spelling of 203125020121 in words is "two hundred three billion, one hundred twenty-five million, twenty thousand, one hundred twenty-one".