121340320555 has 16 divisors (see below), whose sum is σ = 154207446624. Its totient is φ = 91342056960.

The previous prime is 121340320531. The next prime is 121340320561. The reversal of 121340320555 is 555023043121.

It is not a de Polignac number, because 121340320555 - 2⁵ = 121340320523 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 238324 + ... + 547246.

It is an arithmetic number, because the mean of its divisors is an integer number (9637965414).

Almost surely, 2^121340320555 is an apocalyptic number.

121340320555 is a deficient number, since it is larger than the sum of its proper divisors (32867126069).

121340320555 is a wasteful number, since it uses less digits than its factorization.

121340320555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313566.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 121340320555 its reverse (555023043121), we get a palindrome (676363363676).

The spelling of 121340320555 in words is "one hundred twenty-one billion, three hundred forty million, three hundred twenty thousand, five hundred fifty-five".