318225021 has 8 divisors (see below), whose sum is σ = 424395360. Its totient is φ = 212102352.

The previous prime is 318225007. The next prime is 318225029. The reversal of 318225021 is 120522813.

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

It is not a de Polignac number, because 318225021 - 2⁶ = 318224957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 318224982 and 318225000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318225029) 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, 8815 + ... + 26723.

It is an arithmetic number, because the mean of its divisors is an integer number (53049420).

Almost surely, 2^318225021 is an apocalyptic number.

It is an amenable number.

318225021 is a deficient number, since it is larger than the sum of its proper divisors (106170339).

318225021 is a wasteful number, since it uses less digits than its factorization.

318225021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23835.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 318225021 is about 17838.8626599343. The cubic root of 318225021 is about 682.7233784239.

Adding to 318225021 its reverse (120522813), we get a palindrome (438747834).

It can be divided in two parts, 3182 and 25021, that added together give a triangular number (28203 = T₂₃₇).

The spelling of 318225021 in words is "three hundred eighteen million, two hundred twenty-five thousand, twenty-one".