312221121 has 8 divisors (see below), whose sum is σ = 418849440. Its totient is φ = 206870112.

The previous prime is 312221101. The next prime is 312221123. The reversal of 312221121 is 121122213.

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

It is not a de Polignac number, because 312221121 - 2⁵ = 312221089 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 312221121.

It is not an unprimeable number, because it can be changed into a prime (312221123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318756 + ... + 319733.

It is an arithmetic number, because the mean of its divisors is an integer number (52356180).

Almost surely, 2^312221121 is an apocalyptic number.

It is an amenable number.

312221121 is a deficient number, since it is larger than the sum of its proper divisors (106628319).

312221121 is a wasteful number, since it uses less digits than its factorization.

312221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638655.

The product of its digits is 48, while the sum is 15.

The square root of 312221121 is about 17669.7798797834. The cubic root of 312221121 is about 678.4024789845.

Adding to 312221121 its reverse (121122213), we get a palindrome (433343334).

The spelling of 312221121 in words is "three hundred twelve million, two hundred twenty-one thousand, one hundred twenty-one".