312011321 has 4 divisors (see below), whose sum is σ = 315100644. Its totient is φ = 308922000.

The previous prime is 312011317. The next prime is 312011339. The reversal of 312011321 is 123110213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123110213 = 101 ⋅1218913.

It can be written as a sum of positive squares in 2 ways, for example, as 183982096 + 128029225 = 13564^2 + 11315^2 .

It is a cyclic number.

It is not a de Polignac number, because 312011321 - 2² = 312011317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312011296 and 312011305.

It is not an unprimeable number, because it can be changed into a prime (312011341) 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, 1544510 + ... + 1544711.

It is an arithmetic number, because the mean of its divisors is an integer number (78775161).

Almost surely, 2^312011321 is an apocalyptic number.

It is an amenable number.

312011321 is a deficient number, since it is larger than the sum of its proper divisors (3089323).

312011321 is a wasteful number, since it uses less digits than its factorization.

312011321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089322.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 312011321 is about 17663.8421924563. The cubic root of 312011321 is about 678.2504919021.

Adding to 312011321 its reverse (123110213), we get a palindrome (435121534).

It can be divided in two parts, 3120 and 11321, that added together give a palindrome (14441).

The spelling of 312011321 in words is "three hundred twelve million, eleven thousand, three hundred twenty-one".