311212100320 has 48 divisors (see below), whose sum is σ = 802078463088. Its totient is φ = 113168035840.

The previous prime is 311212100267. The next prime is 311212100321. The reversal of 311212100320 is 23001212113.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 311212100294 and 311212100303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311212100321) 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, 88410769 + ... + 88414288.

It is an arithmetic number, because the mean of its divisors is an integer number (16709967981).

Almost surely, 2^311212100320 is an apocalyptic number.

It is an amenable number.

311212100320 is an abundant number, since it is smaller than the sum of its proper divisors (490866362768).

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

311212100320 is a wasteful number, since it uses less digits than its factorization.

311212100320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176825083 (or 176825075 counting only the distinct ones).

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

Adding to 311212100320 its reverse (23001212113), we get a palindrome (334213312433).

The spelling of 311212100320 in words is "three hundred eleven billion, two hundred twelve million, one hundred thousand, three hundred twenty".