312331021 has 8 divisors (see below), whose sum is σ = 330891264. Its totient is φ = 293791680.

The previous prime is 312331009. The next prime is 312331037. The reversal of 312331021 is 120133213.

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 312331021 - 2¹⁷ = 312199949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312330986 and 312331004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312331051) 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, 34036 + ... + 42226.

It is an arithmetic number, because the mean of its divisors is an integer number (41361408).

Almost surely, 2^312331021 is an apocalyptic number.

It is an amenable number.

312331021 is a deficient number, since it is larger than the sum of its proper divisors (18560243).

312331021 is a wasteful number, since it uses less digits than its factorization.

312331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10451.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 312331021 is about 17672.8894355168. The cubic root of 312331021 is about 678.4820675424.

Adding to 312331021 its reverse (120133213), we get a palindrome (432464234).

The spelling of 312331021 in words is "three hundred twelve million, three hundred thirty-one thousand, twenty-one".