321020812 has 24 divisors (see below), whose sum is σ = 642587904. Its totient is φ = 137463312.

The previous prime is 321020803. The next prime is 321020813. The reversal of 321020812 is 218020123.

It is a self number, because there is not a number n which added to its sum of digits gives 321020812.

It is not an unprimeable number, because it can be changed into a prime (321020813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34083 + ... + 42469.

It is an arithmetic number, because the mean of its divisors is an integer number (26774496).

Almost surely, 2^321020812 is an apocalyptic number.

It is an amenable number.

321020812 is an abundant number, since it is smaller than the sum of its proper divisors (321567092).

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

321020812 is a wasteful number, since it uses less digits than its factorization.

321020812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9765 (or 9763 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 321020812 is about 17917.0536640375. The cubic root of 321020812 is about 684.7169249667.

Adding to 321020812 its reverse (218020123), we get a palindrome (539040935).

The spelling of 321020812 in words is "three hundred twenty-one million, twenty thousand, eight hundred twelve".