312113221 has 8 divisors (see below), whose sum is σ = 364996544. Its totient is φ = 261303840.

The previous prime is 312113189. The next prime is 312113267. The reversal of 312113221 is 122311213.

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

It is not a de Polignac number, because 312113221 - 2⁵ = 312113189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312113195 and 312113204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312113621) 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, 518160 + ... + 518761.

It is an arithmetic number, because the mean of its divisors is an integer number (45624568).

Almost surely, 2^312113221 is an apocalyptic number.

It is an amenable number.

312113221 is a deficient number, since it is larger than the sum of its proper divisors (52883323).

312113221 is a wasteful number, since it uses less digits than its factorization.

312113221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036971.

The product of its digits is 72, while the sum is 16.

The square root of 312113221 is about 17666.7263804022. The cubic root of 312113221 is about 678.3243206361.

Adding to 312113221 its reverse (122311213), we get a palindrome (434424434).

The spelling of 312113221 in words is "three hundred twelve million, one hundred thirteen thousand, two hundred twenty-one".