312313021 has 4 divisors (see below), whose sum is σ = 325891872. Its totient is φ = 298734172.

The previous prime is 312313007. The next prime is 312313049. The reversal of 312313021 is 120313213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312313021 - 2⁵ = 312312989 is a prime.

It is a super-2 number, since 2×312313021² = 195078846172292882, 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 = 312312986 and 312313004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312313091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6789391 + ... + 6789436.

It is an arithmetic number, because the mean of its divisors is an integer number (81472968).

Almost surely, 2^312313021 is an apocalyptic number.

It is an amenable number.

312313021 is a deficient number, since it is larger than the sum of its proper divisors (13578851).

312313021 is a wasteful number, since it uses less digits than its factorization.

312313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13578850.

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

The square root of 312313021 is about 17672.3801735929. The cubic root of 312313021 is about 678.4690333885.

Adding to 312313021 its reverse (120313213), we get a palindrome (432626234).

The spelling of 312313021 in words is "three hundred twelve million, three hundred thirteen thousand, twenty-one".