2217021120505 has 4 divisors (see below), whose sum is σ = 2660425344612. Its totient is φ = 1773616896400.

The previous prime is 2217021120493. The next prime is 2217021120511. The reversal of 2217021120505 is 5050211207122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 665143006969 + 1551878113536 = 815563^2 + 1245744^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2217021120505 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 221702112046 + ... + 221702112055.

It is an arithmetic number, because the mean of its divisors is an integer number (665106336153).

Almost surely, 2^{2217021120505} is an apocalyptic number.

It is an amenable number.

2217021120505 is a deficient number, since it is larger than the sum of its proper divisors (443404224107).

2217021120505 is an equidigital number, since it uses as much as digits as its factorization.

2217021120505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443404224106.

The product of its (nonzero) digits is 2800, while the sum is 28.

Adding to 2217021120505 its reverse (5050211207122), we get a palindrome (7267232327627).

The spelling of 2217021120505 in words is "two trillion, two hundred seventeen billion, twenty-one million, one hundred twenty thousand, five hundred five".