123204100121 has 2 divisors, whose sum is σ = 123204100122. Its totient is φ = 123204100120.

The previous prime is 123204100081. The next prime is 123204100147. The reversal of 123204100121 is 121001402321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88854667225 + 34349432896 = 298085^2 + 185336^2 .

It is a cyclic number.

It is not a de Polignac number, because 123204100121 - 2¹⁰ = 123204099097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123204100121.

It is not a weakly prime, because it can be changed into another prime (123204100171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61602050060 + 61602050061.

It is an arithmetic number, because the mean of its divisors is an integer number (61602050061).

Almost surely, 2^123204100121 is an apocalyptic number.

It is an amenable number.

123204100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123204100121 is an equidigital number, since it uses as much as digits as its factorization.

123204100121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 123204100121 its reverse (121001402321), we get a palindrome (244205502442).

The spelling of 123204100121 in words is "one hundred twenty-three billion, two hundred four million, one hundred thousand, one hundred twenty-one".