121503510923 has 2 divisors, whose sum is σ = 121503510924. Its totient is φ = 121503510922.

The previous prime is 121503510907. The next prime is 121503511091. The reversal of 121503510923 is 329015305121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121503510923 - 2⁴ = 121503510907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121503510923.

It is not a weakly prime, because it can be changed into another prime (121503510223) 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, 60751755461 + 60751755462.

It is an arithmetic number, because the mean of its divisors is an integer number (60751755462).

Almost surely, 2^121503510923 is an apocalyptic number.

121503510923 is a deficient number, since it is larger than the sum of its proper divisors (1).

121503510923 is an equidigital number, since it uses as much as digits as its factorization.

121503510923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The spelling of 121503510923 in words is "one hundred twenty-one billion, five hundred three million, five hundred ten thousand, nine hundred twenty-three".