321020016 has 80 divisors (see below), whose sum is σ = 874229760. Its totient is φ = 101305600.

The previous prime is 321019967. The next prime is 321020017. The reversal of 321020016 is 610020123.

It is a junction number, because it is equal to n+sod(n) for n = 321019977 and 321020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321020017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110065 + ... + 112943.

It is an arithmetic number, because the mean of its divisors is an integer number (10927872).

Almost surely, 2^321020016 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 321020016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (437114880).

321020016 is an abundant number, since it is smaller than the sum of its proper divisors (553209744).

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

321020016 is a wasteful number, since it uses less digits than its factorization.

321020016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014 (or 3008 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 321020016 is about 17917.0314505501. The cubic root of 321020016 is about 684.7163590272.

Adding to 321020016 its reverse (610020123), we get a palindrome (931040139).

The spelling of 321020016 in words is "three hundred twenty-one million, twenty thousand, sixteen".