217312903357 has 8 divisors (see below), whose sum is σ = 237118894272. Its totient is φ = 197515291200.

The previous prime is 217312903343. The next prime is 217312903463. The reversal of 217312903357 is 753309213712.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217312903357 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 (217312903657) 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, 2040393 + ... + 2144254.

It is an arithmetic number, because the mean of its divisors is an integer number (29639861784).

Almost surely, 2^217312903357 is an apocalyptic number.

It is an amenable number.

217312903357 is a deficient number, since it is larger than the sum of its proper divisors (19805990915).

217312903357 is a wasteful number, since it uses less digits than its factorization.

217312903357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4189379.

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 217312903357 in words is "two hundred seventeen billion, three hundred twelve million, nine hundred three thousand, three hundred fifty-seven".