313231021 has 8 divisors (see below), whose sum is σ = 321217344. Its totient is φ = 305261280.

The previous prime is 313231013. The next prime is 313231027. The reversal of 313231021 is 120132313.

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 313231021 - 2³ = 313231013 is a prime.

It is a super-2 number, since 2×313231021² = 196227345033404882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313230986 and 313231004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313231027) 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, 39990 + ... + 47176.

It is an arithmetic number, because the mean of its divisors is an integer number (40152168).

Almost surely, 2^313231021 is an apocalyptic number.

It is an amenable number.

313231021 is a deficient number, since it is larger than the sum of its proper divisors (7986323).

313231021 is a wasteful number, since it uses less digits than its factorization.

313231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291.

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

The square root of 313231021 is about 17698.3338481338. Note that the first 3 decimals coincide. The cubic root of 313231021 is about 679.1331377545.

Adding to 313231021 its reverse (120132313), we get a palindrome (433363334).

The spelling of 313231021 in words is "three hundred thirteen million, two hundred thirty-one thousand, twenty-one".