316825217721 has 40 divisors (see below), whose sum is σ = 527497138080. Its totient is φ = 188329525632.

The previous prime is 316825217719. The next prime is 316825217729. The reversal of 316825217721 is 127712528613.

316825217721 is a `hidden beast` number, since 31 + 6 + 8 + 2 + 521 + 77 + 21 = 666.

It is not a de Polignac number, because 316825217721 - 2¹ = 316825217719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (316825217729) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6028671 + ... + 6080996.

It is an arithmetic number, because the mean of its divisors is an integer number (13187428452).

Almost surely, 2^316825217721 is an apocalyptic number.

It is an amenable number.

316825217721 is a deficient number, since it is larger than the sum of its proper divisors (210671920359).

316825217721 is a wasteful number, since it uses less digits than its factorization.

316825217721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12109715 (or 12109706 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 316825217721 in words is "three hundred sixteen billion, eight hundred twenty-five million, two hundred seventeen thousand, seven hundred twenty-one".