311213221320 has 128 divisors (see below), whose sum is σ = 936237219840. Its totient is φ = 82759622400.

The previous prime is 311213221273. The next prime is 311213221357. The reversal of 311213221320 is 23122312113.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109157895 + ... + 109160745.

It is an arithmetic number, because the mean of its divisors is an integer number (7314353280).

Almost surely, 2^311213221320 is an apocalyptic number.

311213221320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

311213221320 is an abundant number, since it is smaller than the sum of its proper divisors (625023998520).

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

311213221320 is a wasteful number, since it uses less digits than its factorization.

311213221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075 (or 5071 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 311213221320 its reverse (23122312113), we get a palindrome (334335533433).

The spelling of 311213221320 in words is "three hundred eleven billion, two hundred thirteen million, two hundred twenty-one thousand, three hundred twenty".