318671187221 has 8 divisors (see below), whose sum is σ = 326604629400. Its totient is φ = 310745410560.

The previous prime is 318671187179. The next prime is 318671187239. The reversal of 318671187221 is 122781176813.

It can be written as a sum of positive squares in 4 ways, for example, as 9133624900 + 309537562321 = 95570^2 + 556361^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 318671187221 - 2¹⁸ = 318670925077 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 (318671181221) 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, 1832156 + ... + 1998533.

It is an arithmetic number, because the mean of its divisors is an integer number (40825578675).

Almost surely, 2^318671187221 is an apocalyptic number.

It is an amenable number.

318671187221 is a deficient number, since it is larger than the sum of its proper divisors (7933442179).

318671187221 is a wasteful number, since it uses less digits than its factorization.

318671187221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3832759.

The product of its digits is 225792, while the sum is 47.

The spelling of 318671187221 in words is "three hundred eighteen billion, six hundred seventy-one million, one hundred eighty-seven thousand, two hundred twenty-one".