1720217130211 has 4 divisors (see below), whose sum is σ = 1762173645624. Its totient is φ = 1678260614800.

The previous prime is 1720217130193. The next prime is 1720217130217. The reversal of 1720217130211 is 1120317120271.

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

It is a cyclic number.

It is not a de Polignac number, because 1720217130211 - 2⁹ = 1720217129699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1720217130211.

It is not an unprimeable number, because it can be changed into a prime (1720217130217) 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 3 ways as a sum of consecutive naturals, for example, 20978257645 + ... + 20978257726.

It is an arithmetic number, because the mean of its divisors is an integer number (440543411406).

Almost surely, 2^{1720217130211} is an apocalyptic number.

1720217130211 is a deficient number, since it is larger than the sum of its proper divisors (41956515413).

1720217130211 is an equidigital number, since it uses as much as digits as its factorization.

1720217130211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41956515412.

The product of its (nonzero) digits is 1176, while the sum is 28.

The spelling of 1720217130211 in words is "one trillion, seven hundred twenty billion, two hundred seventeen million, one hundred thirty thousand, two hundred eleven".