312021321 has 8 divisors (see below), whose sum is σ = 416349120. Its totient is φ = 207853872.

The previous prime is 312021313. The next prime is 312021337. The reversal of 312021321 is 123120213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 312021321 - 2³ = 312021313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312021321.

It is not an unprimeable number, because it can be changed into a prime (312021301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35470 + ... + 43383.

It is an arithmetic number, because the mean of its divisors is an integer number (52043640).

Almost surely, 2^312021321 is an apocalyptic number.

It is an amenable number.

312021321 is a deficient number, since it is larger than the sum of its proper divisors (104327799).

312021321 is a wasteful number, since it uses less digits than its factorization.

312021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80175.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 312021321 is about 17664.1252543113. The cubic root of 312021321 is about 678.2577378277.

Adding to 312021321 its reverse (123120213), we get a palindrome (435141534).

It can be divided in two parts, 31202 and 1321, that added together give a palindrome (32523).

The spelling of 312021321 in words is "three hundred twelve million, twenty-one thousand, three hundred twenty-one".