217210347479 has 4 divisors (see below), whose sum is σ = 221308655976. Its totient is φ = 213112038984.

The previous prime is 217210347463. The next prime is 217210347481. The reversal of 217210347479 is 974743012712.

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 217210347479 - 2⁴ = 217210347463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217210347779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049154169 + ... + 2049154274.

It is an arithmetic number, because the mean of its divisors is an integer number (55327163994).

Almost surely, 2^217210347479 is an apocalyptic number.

217210347479 is a deficient number, since it is larger than the sum of its proper divisors (4098308497).

217210347479 is an equidigital number, since it uses as much as digits as its factorization.

217210347479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4098308496.

The product of its (nonzero) digits is 592704, while the sum is 47.

The spelling of 217210347479 in words is "two hundred seventeen billion, two hundred ten million, three hundred forty-seven thousand, four hundred seventy-nine".