321400056 has 64 divisors (see below), whose sum is σ = 840909600. Its totient is φ = 102256128.

The previous prime is 321400021. The next prime is 321400097. The reversal of 321400056 is 650004123.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 43650 + ... + 50478.

Almost surely, 2^321400056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321400056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (420454800).

321400056 is an abundant number, since it is smaller than the sum of its proper divisors (519509544).

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

321400056 is a wasteful number, since it uses less digits than its factorization.

321400056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6928 (or 6924 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 321400056 is about 17927.6338650699. The cubic root of 321400056 is about 684.9864532814.

Adding to 321400056 its reverse (650004123), we get a palindrome (971404179).

The spelling of 321400056 in words is "three hundred twenty-one million, four hundred thousand, fifty-six".