203445500550121 has 2 divisors, whose sum is σ = 203445500550122. Its totient is φ = 203445500550120.

The previous prime is 203445500550077. The next prime is 203445500550169. The reversal of 203445500550121 is 121055005544302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154979119781721 + 48466380768400 = 12449061^2 + 6961780^2 .

It is a cyclic number.

It is not a de Polignac number, because 203445500550121 - 2⁹ = 203445500549609 is a prime.

It is a super-2 number, since 2×203445500550121² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (203445500559121) 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, 101722750275060 + 101722750275061.

It is an arithmetic number, because the mean of its divisors is an integer number (101722750275061).

Almost surely, 2^{203445500550121} is an apocalyptic number.

It is an amenable number.

203445500550121 is a deficient number, since it is larger than the sum of its proper divisors (1).

203445500550121 is an equidigital number, since it uses as much as digits as its factorization.

203445500550121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 203445500550121 in words is "two hundred three trillion, four hundred forty-five billion, five hundred million, five hundred fifty thousand, one hundred twenty-one".