20121303335505 has 16 divisors (see below), whose sum is σ = 32220280716480. Its totient is φ = 10722629985728.

The previous prime is 20121303335443. The next prime is 20121303335641. The reversal of 20121303335505 is 50553330312102.

It is a cyclic number.

It is not a de Polignac number, because 20121303335505 - 2²⁹ = 20120766464593 is a prime.

It is an unprimeable number.

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, 545718027 + ... + 545754896.

It is an arithmetic number, because the mean of its divisors is an integer number (2013767544780).

Almost surely, 2^{20121303335505} is an apocalyptic number.

It is an amenable number.

20121303335505 is a deficient number, since it is larger than the sum of its proper divisors (12098977380975).

20121303335505 is a wasteful number, since it uses less digits than its factorization.

20121303335505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091474160.

The product of its (nonzero) digits is 40500, while the sum is 33.

Adding to 20121303335505 its reverse (50553330312102), we get a palindrome (70674633647607).

The spelling of 20121303335505 in words is "twenty trillion, one hundred twenty-one billion, three hundred three million, three hundred thirty-five thousand, five hundred five".