312020321 has 4 divisors (see below), whose sum is σ = 312276672. Its totient is φ = 311763972.

The previous prime is 312020257. The next prime is 312020327. The reversal of 312020321 is 123020213.

It is a happy number.

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 312020321 - 2⁶ = 312020257 is a prime.

It is a super-3 number, since 3×312020321³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312020296 and 312020305.

It is not an unprimeable number, because it can be changed into a prime (312020327) 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, 126341 + ... + 128786.

It is an arithmetic number, because the mean of its divisors is an integer number (78069168).

Almost surely, 2^312020321 is an apocalyptic number.

It is an amenable number.

312020321 is a deficient number, since it is larger than the sum of its proper divisors (256351).

312020321 is a wasteful number, since it uses less digits than its factorization.

312020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256350.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 312020321 is about 17664.0969483300. The cubic root of 312020321 is about 678.2570132421.

Adding to 312020321 its reverse (123020213), we get a palindrome (435040534).

The spelling of 312020321 in words is "three hundred twelve million, twenty thousand, three hundred twenty-one".