121203110123 has 2 divisors, whose sum is σ = 121203110124. Its totient is φ = 121203110122.

The previous prime is 121203110089. The next prime is 121203110221. The reversal of 121203110123 is 321011302121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121203110123 is a prime.

It is not a weakly prime, because it can be changed into another prime (121203110423) 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, 60601555061 + 60601555062.

It is an arithmetic number, because the mean of its divisors is an integer number (60601555062).

Almost surely, 2^121203110123 is an apocalyptic number.

121203110123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121203110123 is an equidigital number, since it uses as much as digits as its factorization.

121203110123 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 121203110123 its reverse (321011302121), we get a palindrome (442214412244).

The spelling of 121203110123 in words is "one hundred twenty-one billion, two hundred three million, one hundred ten thousand, one hundred twenty-three".