317216421 has 12 divisors (see below), whose sum is σ = 461237920. Its totient is φ = 210076200.

The previous prime is 317216407. The next prime is 317216453. The reversal of 317216421 is 124612713.

317216421 is a `hidden beast` number, since 3 + 17 + 2 + 1 + 642 + 1 = 666.

It is not a de Polignac number, because 317216421 - 2⁶ = 317216357 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 (317216401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115351 + ... + 118068.

Almost surely, 2^317216421 is an apocalyptic number.

It is an amenable number.

317216421 is a deficient number, since it is larger than the sum of its proper divisors (144021499).

317216421 is a wasteful number, since it uses less digits than its factorization.

317216421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233576 (or 233573 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 317216421 is about 17810.5704849676. The cubic root of 317216421 is about 682.0013279587.

The spelling of 317216421 in words is "three hundred seventeen million, two hundred sixteen thousand, four hundred twenty-one".