321021012 has 48 divisors (see below), whose sum is σ = 809235392. Its totient is φ = 98461440.

The previous prime is 321021011. The next prime is 321021067. The reversal of 321021012 is 210120123.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48528 + ... + 54744.

Almost surely, 2^321021012 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 321021012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (404617696).

321021012 is an abundant number, since it is smaller than the sum of its proper divisors (488214380).

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

321021012 is a wasteful number, since it uses less digits than its factorization.

321021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6568 (or 6566 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 321021012 is about 17917.0592453114. The cubic root of 321021012 is about 684.7170671624.

Adding to 321021012 its reverse (210120123), we get a palindrome (531141135).

The spelling of 321021012 in words is "three hundred twenty-one million, twenty-one thousand, twelve".