121355320505 has 16 divisors (see below), whose sum is σ = 154202361984. Its totient is φ = 91367658240.

The previous prime is 121355320487. The next prime is 121355320507. The reversal of 121355320505 is 505023553121.

It is not a de Polignac number, because 121355320505 - 2⁶ = 121355320441 is a prime.

It is a super-3 number, since 3×121355320505³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121355320507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1713140 + ... + 1782570.

It is an arithmetic number, because the mean of its divisors is an integer number (9637647624).

Almost surely, 2^121355320505 is an apocalyptic number.

It is an amenable number.

121355320505 is a deficient number, since it is larger than the sum of its proper divisors (32847041479).

121355320505 is a wasteful number, since it uses less digits than its factorization.

121355320505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90016.

The product of its (nonzero) digits is 22500, while the sum is 32.

Adding to 121355320505 its reverse (505023553121), we get a palindrome (626378873626).

The spelling of 121355320505 in words is "one hundred twenty-one billion, three hundred fifty-five million, three hundred twenty thousand, five hundred five".