121350155503 has 4 divisors (see below), whose sum is σ = 121353309280. Its totient is φ = 121347001728.

The previous prime is 121350155483. The next prime is 121350155513. The reversal of 121350155503 is 305551053121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305551053121 = 2161 ⋅141393361.

It is a cyclic number.

It is not a de Polignac number, because 121350155503 - 2²⁹ = 120813284591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121350155513) 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 in 3 ways as a sum of consecutive naturals, for example, 1518450 + ... + 1596367.

It is an arithmetic number, because the mean of its divisors is an integer number (30338327320).

Almost surely, 2^121350155503 is an apocalyptic number.

121350155503 is a deficient number, since it is larger than the sum of its proper divisors (3153777).

121350155503 is an equidigital number, since it uses as much as digits as its factorization.

121350155503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3153776.

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 121350155503 in words is "one hundred twenty-one billion, three hundred fifty million, one hundred fifty-five thousand, five hundred three".