217981242363 has 8 divisors (see below), whose sum is σ = 291474442000. Its totient is φ = 144904435488.

The previous prime is 217981242277. The next prime is 217981242397. The reversal of 217981242363 is 363242189712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217981242363 - 2⁹ = 217981241851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217981240363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104096968 + ... + 104099061.

It is an arithmetic number, because the mean of its divisors is an integer number (36434305250).

Almost surely, 2^217981242363 is an apocalyptic number.

217981242363 is a deficient number, since it is larger than the sum of its proper divisors (73493199637).

217981242363 is a wasteful number, since it uses less digits than its factorization.

217981242363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208196381.

The product of its digits is 870912, while the sum is 48.

The spelling of 217981242363 in words is "two hundred seventeen billion, nine hundred eighty-one million, two hundred forty-two thousand, three hundred sixty-three".