321312056 has 16 divisors (see below), whose sum is σ = 648803400. Its totient is φ = 148297824.

The previous prime is 321312049. The next prime is 321312067. The reversal of 321312056 is 650213123.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544666 + ... + 1544873.

Almost surely, 2^321312056 is an apocalyptic number.

It is an amenable number.

321312056 is an abundant number, since it is smaller than the sum of its proper divisors (327491344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321312056 is a wasteful number, since it uses less digits than its factorization.

321312056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089558 (or 3089554 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 321312056 is about 17925.1793854343. The cubic root of 321312056 is about 684.9239306723.

Adding to 321312056 its reverse (650213123), we get a palindrome (971525179).

The spelling of 321312056 in words is "three hundred twenty-one million, three hundred twelve thousand, fifty-six".