312322221 has 12 divisors (see below), whose sum is σ = 470746848. Its totient is φ = 199161864.

The previous prime is 312322183. The next prime is 312322261. The reversal of 312322221 is 122223213.

It is not a de Polignac number, because 312322221 - 2¹⁰ = 312321197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312322194 and 312322203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312322261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 754195 + ... + 754608.

It is an arithmetic number, because the mean of its divisors is an integer number (39228904).

Almost surely, 2^312322221 is an apocalyptic number.

It is an amenable number.

312322221 is a deficient number, since it is larger than the sum of its proper divisors (158424627).

312322221 is a wasteful number, since it uses less digits than its factorization.

312322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508832 (or 1508829 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 312322221 is about 17672.6404648541. The cubic root of 312322221 is about 678.4756953519.

Adding to 312322221 its reverse (122223213), we get a palindrome (434545434).

The spelling of 312322221 in words is "three hundred twelve million, three hundred twenty-two thousand, two hundred twenty-one".