121321003123 has 2 divisors, whose sum is σ = 121321003124. Its totient is φ = 121321003122.

The previous prime is 121321003121. The next prime is 121321003159. The reversal of 121321003123 is 321300123121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121321003123 - 2¹ = 121321003121 is a prime.

Together with 121321003121, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121321003123.

It is not a weakly prime, because it can be changed into another prime (121321003121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660501561 + 60660501562.

It is an arithmetic number, because the mean of its divisors is an integer number (60660501562).

Almost surely, 2^121321003123 is an apocalyptic number.

121321003123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321003123 is an equidigital number, since it uses as much as digits as its factorization.

121321003123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 121321003123 its reverse (321300123121), we get a palindrome (442621126244).

The spelling of 121321003123 in words is "one hundred twenty-one billion, three hundred twenty-one million, three thousand, one hundred twenty-three".