121206346503 has 24 divisors (see below), whose sum is σ = 180069153264. Its totient is φ = 72452096640.

The previous prime is 121206346403. The next prime is 121206346523. The reversal of 121206346503 is 305643602121.

It is not a de Polignac number, because 121206346503 - 2²⁴ = 121189569287 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121206346523) 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 23 ways as a sum of consecutive naturals, for example, 2260500 + ... + 2313497.

It is an arithmetic number, because the mean of its divisors is an integer number (7502881386).

Almost surely, 2^121206346503 is an apocalyptic number.

121206346503 is a deficient number, since it is larger than the sum of its proper divisors (58862806761).

121206346503 is a wasteful number, since it uses less digits than its factorization.

121206346503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574095 (or 4574084 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 121206346503 its reverse (305643602121), we get a palindrome (426849948624).

The spelling of 121206346503 in words is "one hundred twenty-one billion, two hundred six million, three hundred forty-six thousand, five hundred three".