243121020133 has 2 divisors, whose sum is σ = 243121020134. Its totient is φ = 243121020132.

The previous prime is 243121020101. The next prime is 243121020167. The reversal of 243121020133 is 331020121342.

243121020133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212837363649 + 30283656484 = 461343^2 + 174022^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121020133 - 2⁵ = 243121020101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121026133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560510066 + 121560510067.

It is an arithmetic number, because the mean of its divisors is an integer number (121560510067).

Almost surely, 2^243121020133 is an apocalyptic number.

It is an amenable number.

243121020133 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121020133 is an equidigital number, since it uses as much as digits as its factorization.

243121020133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 243121020133 its reverse (331020121342), we get a palindrome (574141141475).

The spelling of 243121020133 in words is "two hundred forty-three billion, one hundred twenty-one million, twenty thousand, one hundred thirty-three".