311021021320 has 32 divisors (see below), whose sum is σ = 699833133720. Its totient is φ = 124402037760.

The previous prime is 311021021317. The next prime is 311021021327. The reversal of 311021021320 is 23120120113.

It can be written as a sum of positive squares in 4 ways, for example, as 227096090116 + 83924931204 = 476546^2 + 289698^2 .

It is a junction number, because it is equal to n+sod(n) for n = 311021021294 and 311021021303.

It is not an unprimeable number, because it can be changed into a prime (311021021327) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 634930 + ... + 1012510.

Almost surely, 2^311021021320 is an apocalyptic number.

It is an amenable number.

311021021320 is an abundant number, since it is smaller than the sum of its proper divisors (388812112400).

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

311021021320 is a wasteful number, since it uses less digits than its factorization.

311021021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398185 (or 398181 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 311021021320 its reverse (23120120113), we get a palindrome (334141141433).

The spelling of 311021021320 in words is "three hundred eleven billion, twenty-one million, twenty-one thousand, three hundred twenty".